Nedarim 31b ~ Great is Milah

נדרים לא, ב

רבי ישמעאל אומר: גדולה מילה שנכרתו עליה שלש עשרה בריתות. רבי יוסי אומר: גדולה מילה שדוחה את השבת חמורה. רבי יהושע בן קרחה אומר: גדולה מילה שלא נתלה לו למשה הצדיק עליה מלא שעה. רבי נחמיה אומר: גדולה מילה שדוחה את הנגעים. רבי אומר: גדולה מילה שכל המצות שעשה אברהם אבינו לא נקרא שלם עד שמל שנאמר "התהלך לפני והיה תמים" דבר אחר גדולה מילה שאלמלא היא לא ברא הקב"ה את עולמו שנאמר כה אמר ה' אם לא בריתי יומם ולילה חקות שמים וארץ לא שמתי

R. Ishmael said, great is [the precept] of Milah (circumcision), Since thirteen covenants were made concerning it.  R. Jose said, circumcision is a great precept, for it overrides the strict laws of  Shabbat. R. Joshua b. Karha said: great is [the precept of] circumcision. For [neglecting] which Moses did not have [his punishment] suspended even for a single hour. R. Nehemiah said, great is [the precept of] circumcision, since it supersedes the laws of Nega'im. Rabbi said, great is circumcision, for in spite of all the commands that Abraham fulfilled, he was not called complete until he circumcised himself, as it is written, “walk before me, and be complete.” Another explanation: great is circumcision, since but for that, the Holy One, Blessed be he, would not have created the universe, as it is written, “but for my covenant (בריתי) by day and night, the laws of Heaven and Earth I would not have established." (Nedarim 31b).

Non-Religiously Motivated Circumcision

Medical circumcision is widely practiced in the US where the rate of male newborn circumcision is about 55%, down from a high of about 62% in 1999. (This change may be due to an increase in the Hispanic population, which is traditionally non-circumcising.) In Europe the rate varies greatly by country. In Britain about 16% of male babies are circumcised; in Denmark, the figure is less than 2%. Worldwide, about one-third of all male boys are circumcised by the age of fifteen.

In 2012 the Task Force on Circumcision of American Academy of Pediatrics reviewed the scientific literature about the health benefits of male circumcision.  The Task Force concluded that “the preventive health benefits of elective circumcision of male newborns outweigh the risks of the procedure.”  However, these health benefits were not enough for them to recommend circumcision as a routine procedure for all male newborns - and this position is also held by Britain's National Health Service.  What then, are the health benefits of male circumcision?

Global prevalence of male circumcision. From Male circumcision: global trends and determinants of prevalence, safety and acceptability. World Health Organizations and the Joint United Nations Program on HIV/AIDS, 2007. 

Global prevalence of male circumcision. From Male circumcision: global trends and determinants of prevalence, safety and acceptability. World Health Organizations and the Joint United Nations Program on HIV/AIDS, 2007. 

In the pluralistic society of the United States, where parents are afforded wide authority for determining what constitutes appropriate child-rearing and child welfare, it is legitimate for the parents to take into account their own cultural, religious, and ethnic traditions, in addition to medical factors, when making this choice.
— Technical Report: Male Circumcision. American Academy of Pediatrics. Pediatrics 2012; 130 (3): e756-785.

 

Sexually Transmitted Diseases – including HIV

In 2005 the first study on the role of circumcision in protecting against HIV infection was published. The study was run in South Africa, where over 3,200 men were randomized to circumcision or no-circumcision. The study was stopped early when an interim analysis showed that HIV infection was 60% lower in the circumcision group. Male circumcision prevented six out of ten potential HIV infections. This was a remarkable finding.  In fact the study team commented that male circumcision provided an equivalent degree of protection against acquiring HIV infection “to what a vaccine of high efficacy would have achieved.”

And male circumcision is not just protective against HIV. It decreases the transmission rates for human papilloma virus (HPV) and herpes simplex virus 2 (HSV-2) in female partners, and the balance of evidence suggests that it also protective against syphilis. (But it doesn’t seem to protect against the two most common sexually transmitted diseases in the US – chlamydia and gonorrhea.) A team from John Hopkins University School of Public Health predicted that if neonatal circumcision rates in the US would fall to European levels of about 10%, the result would be an additional $500 million in healthcare costs. Over a ten year period, there would be more than 4,000 new HIV infections in men and more than 125,000 new herpes simplex infections.

With an estimated cost per infection averted in the range of $150 to $900 over a 10-year period (depending on the local incidence of HIV infection), male circumcision appears to be one of the most cost-effective preventive approaches, requiring only a one-time intervention.
— Piot and Quinn. Response to the AIDS Pandemic - A Global Health Model.New England Journal of Medicine 2013. 368;23. 2210-2218

Urinary Tract Infections and Phimosis

Male circumcision also protects against urinary tract infections – but according to the Task Force you’d have to circumcise about 100 babies to prevent one such infection. Phimosis (an inability to retract the foreskin) and other inflammatory problems of the penis are either absent or much reduced in circumcised boys:  “From ages 1 through 8 years, the rates were 6.5 penile problems per 100 circumcised boys over the study period, compared with 17.2 penile problems per 100 uncircumcised boys.”

Penile and Cervical Cancer

Penile cancer is rare, but cervical cancer is not.  Male circumcision reduces the risk of penile cancer by about 50%, and it seems that it also reduces the odds of cervical cancer in the man’s partner (especially if he has had six or more lifetime sexual partners.)

The Risks from Male Circumcision

There are of course risks associated with the procedure of male circumcision itself, but these are rare.  A recent study reviewed 1.4 million male circumcisions and found only 16 cases in which an adverse event occurred, although ten of these were serious.  Overall, the procedure is very safe when properly performed in the first year of life, but complications rise up to twenty-fold if the procedure is performed after infancy. (It goes without saying that the dangerous practice of metzizah  be-peh should never be performed.)

What about life after a safely performed circumcision? Does that change? One recent Belgium study of more than 1,000 men,  “circumcised men reported decreased sexual pleasure and lower orgasm intensity. They also stated more effort was required to achieve orgasm, and a higher percentage of them experienced unusual sensations (burning, prickling, itching, or tingling and numbness of the glans penis).” A Danish study found a similar result: “circumcised men …were more likely to report frequent orgasm difficulties…and women with circumcised spouses more often reported incomplete sexual needs fulfillment.” These were however, individual studies, and in 2013, the Journal of Sexual Medicine published an exhaustive meta-analysis of 36 publications describing the effects of male circumcision on aspects of male sexual function. It found no evidence overall "for any significant difference in components of sexual function, sensitivity, sexual sensation, or sexual pleasure in men who are circumcised and men who are not." Furthermore, it examined several studies of men circumcised in adulthood, which are of particular research interest since these men serve as their own control.  In this group too, the meta-analysis failed to find any adverse effect of circumcision on the parameters examined. 

The Costly Investment of Brit Milah

The medical benefits of male circumcision are well documented, and its risks are small. But none of these benefits were known to those who first introduced the ritual, and anthropologists wonder why circumcision, and other painful and irrevocable rites of passage, should be so common across cultures.  One possible answer comes from the theory of costly investment.

This is based on the finding that religious, ethnic and tribal groups that demand more from their members do better in the long run than those that demand less. These groups have to insure that all members contribute equally, and that there are no “free-riders” – those who are taking from the group but not giving back. One way to weed out the free-riders is to demand a costly and irrevocable investment in order to join the group – and that investment might be circumcision, tattooing or scarification, all of which are used as a means to induct new members. Once the costly investment is made, a person will be less likely to leave the group. Joseph Henrich (from the departments of Psychology and Economics at the University of British Columbia) has a term for these investmentscredibility enhancing displays (CREDs):

Participation in rituals involving costly acts will elevate people's degree of belief commitment. If the professed beliefs involve group commitment, cooperation toward fellow in- group members, or the hatred of out-groups, then ritual attendees will trust, identify and cooperate with in-group members more than non attendees.

...In learning how to behave and what to believe, learners give weight to both prestige and CREDs, among other things. Thus, successful cultural forms, especially those involving deep commitment to counterintuitive beliefs, will tend to begin with and be sustained by prestigious individuals performing CREDs. Cues of prestige influence who people pay attention to for learning, while CREDs convince them that the prestigious model really believes (is committed to) his or her professed beliefs. The “virtuous- ness” arises from these prestigious individuals' role as models. CGS [Cultural Group Selection] will favor, over long swaths of historical time, religions with role models who effectively transmit beliefs and practices that strengthen in-group cooperation, promote intra-group harmony and increase competitiveness against out-groups. 

From Henrich, J. The evolution of costly displays, cooperation and religion: credibility enhancing displays and their implications for cultural evolution. Evolution and Human Behavior 2009; 30: 244-260.

From Henrich, J. The evolution of costly displays, cooperation and religion: credibility enhancing displays and their implications for cultural evolution. Evolution and Human Behavior 2009; 30: 244-260.

Nelson Mandela's Ritual Circumcision

Whether or not Brit Milah is just another credibility enhancing display, it is a very widely practiced ritual- and extends far beyond the Jewish and Muslim communities.  Nelson Mandela recalled his own circumcision (at the age of 16!) in his autobiography

When I was sixteen, the regent decided that it was time I became a man. In Xhosa tradition this is achieved through one means only: circumcision.  In my tradition, an uncircumcised male cannot be heir to his father's wealth, cannot marry or officiate at tribal rituals. An uncircumcised Xhosa man is a contradiction in terms, for he is not considered a man at all, but a boy...

The night before the circumcision there was a ceremony near our huts with singing and dancing. Women came from the nearby villages, and we danced to their singing and clapping...At dawn, when the stars  were still in the sky...we were escorted to the river to bath in its cold waters, a ritual that signified our purification before the ceremony...We were clad only in our blankets, and as the  ceremony began, with drums pounding, we were ordered to sit on a blanket n the ground with our legs spread out in front of us...I could see a thin elderly man emerged from a tent and knee in front of the first boy...The old man was a famous ingcibi, ad circumcision expert...

Suddenly, I heard the first boy cry out: "Ndyindoda!"   (I am a man!), which we were trained to say at the moment of circumcision...before I new it, the old man was kneeling in from of me...without a word he took my foreskin, pulled it forward, and then, in a single motion, brought down his assegai...I felt fire shooting through my veins; the pain was so intense that I buried my chin into my chest. Many seconds seemed to pass before I remembered the cry, and then I recovered and called out, "Ndiyindoda"...A boy may cry; a man conceals his pain...I was given my circumcision name, Dalibunga, meaning "Founder of the Bunga,"...

Jewish Criticism of Milah

Among the most vocal critics of the practice today are those who are born Jewish. But circumcision has been criticized for as long as it has been practiced, and these self-criticisms are not new.  In the 1780s, a British Jew (who wrote anonymously) published a pamphlet called A Peep into the Synagogue, in which he was critical of many Jewish practices.  And his most scathing words were those he penned about circumcision:

In the extravagant Catalogue of Jewish absurdities, there is not one more shameful than that of Circumsition [sic], it is a barbarous violation of the principles of Nature,  For what can be more unhuman, than to punish an Infant by a cruel operation on a part of its body, done by a bungling Butcher of a Priest! Or what can be more insulting to all-wise Creator, than for a stupid Fool of a Fellow, to presume to correct His workmanship, by finding one superfluous part, and taking that away to reduce the subject to perfection. (Anonymous. A Peep into the Synagogue, or A Letter to the Jews. London, undated.) 

The Joy of Milah

Although it is under attack in Europe and is less popular than it has been US, circumcision remains a time for joy for the many faith communities in which it is practiced. The ritual is often accompanied by feasting and gift-giving, whether it is performed in Muslim or Jewish communities, or by members of African tribes.  The Talmud explains why, for Jews, the ritual is one that is associated with so much joy. It is an explanation that is as simple as it is profound:

שבת קל, א

 תניא רשב"ג אומר כל מצוה שקיבלו עליהם בשמחה כגון מילה דכתיב "שש אנכי על אמרתך כמוצא שלל רב" עדיין עושין אותה בשמחה

It was taught in a Baraisa: Rabban Shimon ben Gamliel says: Any commandment that the Jewish people accepted with joy - like circumcision, as it it written: "I rejoice over your word like one who finds great spoils" [Ps. 119:162]  - they still perform with joy...(Shabbat 130b.)

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Nedarim 20b ~ Shame

נדרים כ, א

תניא "בעבור תהיה יראתו על פניכם" זו בושה "לבלתי תחטאו" מלמד שהבושה מביאה לידי יראת חטא מיכן אמרו סימן יפה באדם שהוא ביישן. אחרים אומרים כל אדם המתבייש לא במהרה הוא חוטא, ומי שאין לו בושת פנים בידוע שלא עמדו אבותיו על הר סיני

It was taught in a Baraisa: "So that the awe of Him will be on your faces" (Ex. 20:17). This refers to the characteristic of being susceptible to shame [since bushing is that which is noted "on your faces". The verse continues] "So that you will not sin". This teaches that shame leads to the fear of sin.  From this [teaching] they said it is a good sign for a person to be [easily] embarrassed. Others said that any person who feels embarrassed will not quickly sin. And if a person is not [the kind of person who is] embarrassed - it is known that his ancestors did not stand and Mount Sinai. 

Detail from A Girl with a Black Mask by Pietro Antonio Rotari

Detail from A Girl with a Black Mask by Pietro Antonio Rotari

Charles Darwin called blushing "the most peculiar and the most human of all expressions." It occurs when the face, ears, neck and upper chest redden on darken in response to perceived social scrutiny or evaluation. It is this feature of blushing - that it is seen on a person's face, that leads the Baraisa on tomorrow's daf to understand the verse "So that the awe of Him will be on your faces"as referring to blushing. And as the commentary of the Ran explains, it is because blushing is so easily seen by others, that is serves to prevent a person from sinning:

מלמד שהבושה מביאה לידי יראת חטא, דעל פניכם משמע בושת פנים,  וכתיב בתריה לבלתי תחטאו 

WHEN DO WE BLUSH?

There appear to be four social triggers that result in blushing: a) a threat to public identity; 2) praise or public attention 3) scrutiny, and oddly enough, 4) accusations of blushing. This last trigger is especially fascinating: just telling a person that they are blushing - even when they are not - can trigger a blush. 

Blushing is not only triggered by certain social situations; it also triggers other responses in those who blush. The most commonly associated behaviors are averting the gaze and smiling. Although gaze aversion is a universal feature of embarrassment, its frequency differs across cultures: in the United kingdom 41% report averting their eyes when they are embarrassed, whereas only 8% of Italians report doing so. Smiling is also a common response. Up to a third of those who are embarrassed display a "nervous" or "silly grin." 

The blush is ubiquitous yet scarcely understood. In the past it has attracted little scientific attention and it is only in recent years that it has begun to attract systematic scientific attention.
— Crozier and de Jong. The study of the blush. In Crozier and de Jong (eds.) The Psychological Significance of the Blush. Cambridge University Press 2013.

WHY DO WE BLUSH?

It is unclear why humans blush. Of course, we blush when we are embarrassed, but why should this physiological response occur? The blood vessels in the face (and the other areas that blush) seem to differ structurally from other vessels, and so respond in a unique way. But just how they do so, and why, remains a physiological mystery.  Here's the surgeon Atul Gawande's explanation, from the pages of The New Yorker.

Why we have such a reflex is perplexing. One theory is that the blush exists to show embarrassment, just as the smile exists to show happiness. This would explain why the reaction appears only in the visible regions of the body (the face, the neck, and the upper chest). But then why do dark-skinned people blush? Surveys find that nearly everyone blushes, regardless of skin color, despite the fact that in many people it is nearly invisible. And you don’t need to turn red in order for people to recognize that you’re embarrassed. Studies show that people detect embarrassment before you blush. Apparently, blushing takes between fifteen and twenty seconds to reach its peak, yet most people need less than five seconds to recognize that someone is embarrassed—they pick it up from the almost immediate shift in gaze, usually down and to the left, or from the sheepish, self-conscious grin that follows a half second to a second later. So there’s reason to doubt that the purpose of blushing is entirely expressive.

There is, however, an alternative view held by a growing number of scientists. The effect of intensifying embarrassment may not be incidental; perhaps that is what blushing is for. The notion isn’t as absurd as it sounds. People may hate being embarrassed and strive not to show it when they are, but embarrassment serves an important good. For, unlike sadness or anger or even love, it is fundamentally a moral emotion. Arising from sensitivity to what others think, embarrassment provides painful notice that one has crossed certain bounds while at the same time providing others with a kind of apology. It keeps us in good standing in the world. And if blushing serves to heighten such sensitivity this may be to one’s ultimate advantage.

BLUSHING AND CROSSING BOUNDARIES

So blushing may confer an advantage. It keeps us in good social standing, insuring that we do not step outside of the bounds of accepted behavior. This notion is supported by some recent work (published more than a decade after Gawande's 2001 article) that supports this notion of blushing having a social utility.  Those who blush frequently showed a positive association between blushing and shame. These frequent blushers generally behaved less dominantly and more submissively. Writing in the journal Emotion in 2011 (yes, that really is the name of this academic journal), three Dutch psychologists demonstrated that blushing after a social transgression serves a remedial function. In their (highly experimental lab) work on human volunteers, blushers were judged more positively and were perceived as more trustworthy than their non-blushing counterparts.  

But Not All Shame is Useful

While there are useful features of shame, it also has negative effects.  Perhaps the best documented of these is shame as a cause for delay in many types of medically recommended examinations that involve the parts of the body usually kept private.  Interestingly, other types of shame that are an impediment to timely medical testing is the shame that the symptom might turn out to be from a "trivial cause" (though in my many years serving in the emergency department, I recall no patients exhibiting this kind of embarrassment).  

Negative consequences of fear of embarrassment on health. From Harris. Embarrassment: A Form of Social Pain. American Scientist 2006. 94; 524-533.

Negative consequences of fear of embarrassment on health. From Harris. Embarrassment: A Form of Social Pain. American Scientist 2006. 94; 524-533.

Do Monkeys Feel Shame?

In a 2006 paper, a group of researchers demonstrated that primate color vision has been selected to discriminate changes in skin color - those changes (like blushing) that give useful information about the emotional state of another.  But does this mean that non-human primates feel shame? That's a harder question. 

The primate face and rump undergo colour modulations (such as blushing or blanching on the human face, or socio-sexual signalling on the chimpanzee rump), some which may be selected for signalling and some which may be an inevitable consequence of underlying physiological modulations.
— Changizi, Zhang and Shimojo. Bare skin, blood and the evolution of primate colour vision. Biology Letters 2006. (2) 217.

Frans De Waal directs the Living Links Center at the Yerkes National Primate Research Center at Emory University in Atlanta. In his wonderful book The Bonobo and the Atheist (guess which of these he is), De Waal discusses emotional control among primates - and in particular, the role of shame. When a human feels shame after a transgression, "we lower our face, avoid the gaze of others, slump our shoulders, bend our knees, and generally look diminished in stature...We feel ashamed and hide our face behind our hands or "want to sink into the ground." This is rather like the submissive displays made by other primates: "Chimpanzees crawl in the dust for their leader, lower their body so as to look up at him or turn their rump towards tim to appear unthreatening...shame reflects awareness that one has upset others, who need to be appeased."

Only humans blush, De Waal writes, and he doesn't know of "any instant face reddening in other primates."

Blushing is an evolutionary mystery... The only advantage of blushing that I can imagine is that it tells others that you are aware of how your actions affect them.  This fosters trust.  We prefer people whose emotions we can read from their faces over those who never show the slightest hint of shame or guilt. That we evolved an honest signal to communicate unease about rule violations says something profound about our species. (The Bonobo and the Atheist, 155.)

And then De Wall makes a remarkable observation, one which seems to have first been observed in the Baraisa with which we opened:

Blushing is part of the same evolutionary package that gave us morality.

So it turns out that evolutionary biologists, psychologists, and social scientists, while they may disagree on some details, agree on one feature of the emotion of shame. It is a vital emotion for any ethically sound society. Which is precisely what we learned in this daf:

 ומי שאין לו בושת פנים בידוע שלא עמדו אבותיו על הר סיני

And if a person is not [the kind of person who is] embarrassed - it is known that his ancestors did not stand and Mount Sinai. 

[See also Talmudology on Ketuvot 67b, from where some, but not all, of this post is taken.]

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Nedarim 15a ~ How Long Can You Go Without Sleep?

נדרים טו א

והא"ר יוחנן שבועה שלא אישן שלשה ימים מלקין אותו וישן לאלתר

...Rabbi Yochanan said "An oath that I will not sleep for three days" - we lash him [since he took an oath in vain] and he may sleep immediately...(Nedarim 15a)

How long can you go without sleep? If you are like me, staying awake for just one night can be very challenging.  I worked my share of night shifts in the emergency department for over fifteen years (amounting to hundreds of overnight shifts) but it never got any easier with time. We all push ourselves when we need to, but is there a physiological limit to the amount of time that you can stay awake?

The World Record for Staying Awake

The world record for staying awake is an amazing eleven days. Eleven days – that’s 264 hours (and 24 minutes to be precise) without sleep. It was set in 1965 by Randy Gardner, who was then seventeen years old. Gardner seems to have suffered little if any harm by his marathon period of sleep deprivation. But don’t try and beat the record. The Guinness Book of Records no longer has an entry for staying awake – because it is considered too dangerous an ordeal to undertake. (You can hear a review of sleep deprivation stunts in general and a wonderful interview with Gardner himself here.)

The Health Risks of Sleep Deprivation

A 1970 study of four volunteers who stayed awake for 205 hours (that’s eight and a half days!) noted some differences in how the subjects slept once they were allowed to do so, but follow-up testing of the group conducted 6-9 months after the sleep deprivation showed that their sleep patterns were similar to the pre-deprivation recordings.

Although Randy Gardner and these four volunteers seem to have suffered no long-term health consequences of staying awake for over a week, scientists have long noted that sleep deprivation is rather bad for the body. Or to be more precise, the bodies of unfortunate laboratory rats who are not allowed to sleep. In these animals, prolonged sleep deprivation causes the immune system to malfunction. This results in infection and eventual lethal septicemia. The physiologist who kept these rats awake noted that there are “far-reaching physical implications resulting from alterations in immune status [which] may explain why sleep deprivation effects are risk factors for disease and yet are not well defined or specifically localized.” In other words, sleep deprivation makes rats really sick, but we don’t know how, or why…

One possible explanation was suggested in a 2013 by a group from the University of Rochester Medical Center. They demonstrated that during sleep, the space between the cells of the brain (the interstitial space) increased by up to 60%, allowing toxic metabolites to be cleared. This raises the question of whether the brain sleeps in order to expel these toxic chemicals, or rather it is the chemicals themselves that drive the brain to switch into a sleep state.

The extracellular (interstitial) space in the cortex of the mouse brain, through which cerebral spinal fluid moves, increases from 14% in the awake animal to 23% in the sleeping animal, an increase that allows the faster clearance of metabolic waste…

The extracellular (interstitial) space in the cortex of the mouse brain, through which cerebral spinal fluid moves, increases from 14% in the awake animal to 23% in the sleeping animal, an increase that allows the faster clearance of metabolic waste products and toxins. From Suzana Herculano-Houzel. Sleep it out. Science 2013: 342; 316

Not having any sleep is bad for your health - but so too is going without enough sleep. Chronic restriction of sleep to six hours or less per night can produce cognitive performance deficits equivalent to up to two nights of total sleep deprivation. So be sure to get a full night's rest.

How long did the Vilna Gaon stay awake?

In his recent book on the Vilna Gaon, Eli Stern reviewed an episode in which the Gaon (d. 1797) was jailed on charges of kidnapping. (It’s a long story, but the Vilna Gaon was involved in the kidnapping of a young Jewish man who had converted to Christianity.) This episode occurred in January 1788, after which the Gaon was arrested and held for over a month.  The case was later tried, and on September 15, 1789 (sic) the Gaon of Vilna (together with others involved in the kidnapping) was sentenced to twelve weeks in jail.  Although it is unclear how long he was imprisoned, he was there over Sukkot, and the Lithuanian authorities were hardly in the practice of providing imprisoned Jews with a sukkah.  But since one is not permitted to sleep outside of the sukkah, what was the Gaon to do?  Simple.  He’d stay awake, and by doing so he would not transgress the prohibition of sleeping outside the sukkah.  Here’s how the episode is described in the work Tosefet Ma’aseh Rav published in 1892. 

Our Leader, teacher and Rabbi may he rest in peace, when he was imprisoned on Sukkot, tried with all his strength, and walked from one place to another, and held his eyelids open, and made an extraordinary effort not to sleep outside the sukkah – not even a brief nap – until the authorities released him to a sukkah.

We don’t know for how long the sixty-nine year-old Elijah stayed awake, but any suggestion that he was awake for the entire holiday of Sukkot seems to be far fetched (though as we have seen, not entirely impossible).

Hard, But Not Impossible

In today’s daf, Rabbi Yochanan ruled that since it impossible to stay awake for more than three days, any vow to do so is considered to have been a vow made in vain – and punishment follows swiftly.  Here is how the ArtScroll Talmud explains this ruling, (based on the explanation of the Ran).

Since it is impossible for a person to go without sleep for three days, the man has uttered a vain oath. Hence, he receives lashes for violating the prohibition (Exodus 20:7): לא תשא את שם ה׳ אלוקיך לשוה, You shall not take the Name of Hashem, your God, in vain. And since the oath -being impossible to fulfill -has no validity, he is not bound by it at all and may sleep immediately.

We have seen however, that while it’s not a good idea to do so on any kind of regular basis, it is certainly possible to stay up for longer than three days. (Back in the 1970s, some volunteers would even do so for as little as $100). Maimonides codified this law and also assume that it is impossible to stay awake for three consecutive days. 

רמב"ם הלכות שבועות פרק ה הלכה כ

נשבע שלא יישן שלשת ימים, או שלא יאכל כלום שבעת ימים וכיוצא בזה שהיא שבועת שוא, אין אומרין יעור זה עד שיצטער ויצום עד שיצטער ולא יהיה בו כח לסבול ואח"כ יאכל או יישן אלא מלקין אותו מיד משום שבועת שוא ויישן ויאכל בכל עת שירצה

Based on what we've reviewed, Rabbi Yochanan was incorrect when he stated that it was impossible to stay awake for three days. It's certainly not impossible, but that hardly means it's a good idea to try. 

Sleep deprivation reduces learning, impairs performance in cognitive tests, prolongs reaction time, and is a common cause of seizures. In the most extreme case, continuous sleep deprivation kills rodents and flies within a period of days to weeks. In humans, fatal familial or sporadic insomnia is a progressively worsening state of sleeplessness that leads to dementia and death within months or years.
— Lulu Xie et al. Sleep Drives Metabolite Clearance from the Adult Brain. Science 2013. 342.317

This may explain the teaching of Rabbi Chaninah ben Chachina'i in Masechet Avot  (3:4) who taught that one who stays awake at night "will forfeit with his life."  Now that's a warning to heed.

רבי חנינא בן חכינאי אומר הנעור בלילה ... הרי זה מתחייב בנפשו 

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Nedarim 8b ~ Heliotherapy

נדרים  ח ב׳

שמש צדקה ומרפא אמר אביי ש"מ חרגא דיומא מסי ופליגא דר"ש בן לקיש דאמר אין גיהנם לעולם הבא אלא הקב"ה מוציא חמה מנרתיקה צדיקים מתרפאין בה ורשעים נידונין בה

“The sun of righteousness, with healing in its rays” (Malachi 3:20)...Abaye said: “We learn from here that the dust of the sun heals”…Rabbi Shimon ben Lakish said, “there is no hell in the world to come. Rather God takes the sun out of its canopy; the righteous are healed by it and the wicked are punished by it” (Nedarim 8b.)

Image of the sun.jpg

A History of Heliotherapy

In 1903, the Nobel prize for Medicine was awarded to a Dane named Niels Finsen. Finsen had invented a focusable carbon-arc torch to treat – and cure – patients with lupus vulgaris, a painful skin infection caused by tuberculosis.  While this was the start of the modern medical use of phototherapy, using the sun as a source of healing is much, much older. Older even than the Talmud, which mentions it in today’s daf

The Nobel Prize in Physiology or Medicine 1903 was awarded to Niels Ryberg Finsen “in recognition of his contribution to the treatment of diseases...with concentrated light radiation, whereby he has opened a new avenue for medical science”.

Perhaps the earliest reference to heliotherapy – that is, using sunlight to heal - is found in Egyptian papyrus records from over 3,500 years ago, which record using the sun, together with ingesting a local weed, to treat skin conditions. The active ingredients of that weed, Ammi majus, were isolated in 1947. These ingredients, together with heliotherapy, were used in the first clinical trials to treat vitiligo, which were conducted, rather fittingly, in Egypt.  Further work determined that it was only a narrow part of the sun’s spectrum that was needed to treat vitiligo, psoriasis, and other skin conditions, and so lamps were developed that produced only narrow band ultraviolet light (UVB). These UVB lamps are now a mainstay of treatment for psoriasis. 

Sunlight for Healthy Bones

For most white people, a half-hour in the summer sun in a bathing suit can initiate the release of 50,000 IU (1.25 mg) vitamin D into the circulation within 24 hours of exposure
— Environmental Health Perspectives 2008:116;4. A162

But ultraviolet light – UVB – can also be extremely dangerous. Too much exposure to sunlight will cause skin cancer, as the light produces molecules that directly damage DNA. Here is the great paradox of sunlight – too much of it will burn and can kill – but get the dose right and it is not only curative, but essential for healthy living. Sunlight is needed to produce vitamin D in the skin, and vitamin D is needed to produce healthy bones. Without it, you will develop rickets, a skeletal deformity that is characterized by bowed legs. 

Typical presentation of 2 children with rickets. The child in the middle is normal; the children on both sides have severe muscle weakness and bone deformities, including bowed legs (right) and knock knees (left). From Holick M. Sunlight and vi…

Typical presentation of 2 children with rickets. The child in the middle is normal; the children on both sides have severe muscle weakness and bone deformities, including bowed legs (right) and knock knees (left). From Holick M. Sunlight and vitamin D for bone health and prevention of autoimmune diseases, cancers, and cardiovascular diseaseAm J Clin Nutr 2004;80(suppl):1678S–88S.

Sunlight for a Healthy Immune System

The sun’s light has been shown to have effect the immune system, although many of these effects are only poorly understood. 

When some nerve fibres are exposed to sunlight, they release a chemical called neuropeptide substance P. This chemical seems to produce local immune suppression.  Exposure to the ultraviolet wavelengths in sunlight can change the regulation of T cells in the body which can also modulate autoimmune diseases.

Sunlight to Treat Melanoma?

While sunlight can cause skin cancer, it has been shown to release a hormone called alpha melanocyte-stimulating hormone. This hormone appears to limit the damage to DNA damage from sunlight and so may actually reduce the risk of melanoma (but don't try this as a treatment yet. It's certainly not ready for prime time.)

Sunlight for Your Mood

Then there’s sunlight for your mood. Seasonal affective disorder – SAD – is caused by a lack of exposure to sunlight, which most affects those living in the northern latitudes in the winter.  SAD was first described in 1984 by Norman Rosenthal working at the National Institute of Mental Health but why it happens is still something of a mystery.  Rosenthal went on to write several best selling books on SAD and how to beat it. The answer appears to be something to do with sitting in front of a lamp that mimics sunlight (but the evidence that this works is still controversial).

 Sunlight for Babies with Jaundice

Sunlight is also a great treatment for babies with neonatal jaundice. This condition is very common and is caused when the baby breaks down the fetal hemoglobin with which it was born. A product of that breakdown is bilirubin, and if this is allowed to build up in the tissues it can cause lethargy, difficultly feeding, and in rare and extreme cases, brain damage. However, sunlight (or more precisely, the blue band of the spectrum at 459nm)  breaks down this dangerous bilirubin molecule into a harmless one called biliverdin.  So the best treatment for a newborn baby with mild jaundice is to put them out in the sun.  (Failing that, or if the degree of jaundice is not mild, you can consider phototherapy in the hospital.) 

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The absorbance spectrum of bilirubin bound to human serum albumin (white line) is shown superimposed on the spectrum of visible light. Clearly, blue light is most effective for phototherapy, but because the transmittance of skin increases with increasing wavelength, the best wavelengths to use are probably in the range of 460 to 490 nm. Term and near-term infants should be treated in a bassinet, not an incubator, to allow the light source to be brought to within 10 to 15 cm of the infant (except when halogen or tungsten lights are used), increasing irradiance and efficacy. For intensive phototherapy, an auxiliary light source (fiber-optic pad, light-emitting diode [LED] mattress, or special blue fluorescent tubes) can be placed below the infant or bassinet. If the infant is in an incubator, the light rays should be perpendicular to the surface of the incubator in order to minimize loss of efficacy due to reflectance. From Maisels and McDonagh. Phototherapy for Neonatal JaundiceNew England Journal of Medicine 2008.358;920-928.

Sunlight for Infectious Diseases

 We don't treat infectious diseases with sunlight any more. But it wasn't always that way. Less than eighty years ago sunlight was recommended as a therapy for some patients with tuberculosis. The authors, writing in the journal Diseases of the Chest were cautious:

Even in those cases where the sun can be of great value, it is in no sense a specific cure for any manifestation of tuberculosis. Rest, good food, and fresh air, are still the fundamentals in treating all forms of the disease; and the sun, where it should be used, is only a valuable adjutant...Heliotherapy is not indicated in all cases of tuberculosis. The majority of patients with this disease should never use it...It is not a sure cure for any type of tuberculosis, but is often, especially in some of the extrapulmonary cases, a very valuable—or even necessary—aid.

In today's daf, Abaye noted that the sun can heal, and Rabbi Shimon ben Lakish (a.k.a Resh Lakish) taught that the sun can both reward and punish. Their insights were more correct than they could ever have guessed.  

Bright light therapy and the broader realm of chronotherapy remain underappreciated and underutilized, despite their empirical support. Efficacy extends beyond seasonal affective disorder and includes nonseasonal depression and sleep disorders, with emerging evidence for a role in treating attention-deficit/hyperactivity disorder, delirium, and dementia.
— Schwartz and Olds. The Psychiatry of Light. Harvard Review of Psychiatry 2015. 23 (3); 188.
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