Guiding questions:
What do we mean by mitzvah or "obligation?" To whom are we obligated? How do we become obligated?
What's an individual obligation and what's a community obligation?
Who decides what constitutes an acceptable risk? What happens when risks represent a collision of principles?
What is the relationship between science and religion and what should it be?
What do we mean by "health?"
How might the meaning of "shmirat hanefesh" shift when we read about it in the context of its source in Deuteronomy, which is about idolatry and being too caught up with the image of a particular human form?
(טו) וְנִשְׁמַרְתֶּ֥ם מְאֹ֖ד לְנַפְשֹׁתֵיכֶ֑ם...
(15) Take very good care of yourselves
...
בִּתְלָתָא בְּשַׁבְּתָא מַאי טַעְמָא לָא? מִשּׁוּם דְּקָיְימָא לֵיהּ מַאְדִּים בְּזָוֵוי. מַעֲלֵי שַׁבְּתָא נָמֵי קָיְימָא בְּזָוֵוי! כֵּיוָן דְּדָשׁוּ בֵּיהּ רַבִּים — ״שׁוֹמֵר פְּתָאִים ה׳״.
The Gemara explains: On the third day of the week, what is the reason that one does not let blood? It is because the planet Mars is dominant during the even hours. Since it is a planet of blood, and the even hours are a bad omen, that combination gives cause for concern. The Gemara asks: On Shabbat eve, Mars also dominates during the even hours. The Gemara answers: Since the multitudes have already become accustomed to letting blood on Shabbat eve, the verse: “The Lord protects the simple-hearted” (Psalms 116:6) applies in this case.
אֶחָד הַגַּג וְאֶחָד כָּל דָּבָר שֶׁיֵּשׁ בּוֹ סַכָּנָה וְרָאוּי שֶׁיִּכָּשֵׁל בָּהּ אָדָם וְיָמוּת. כְּגוֹן שֶׁהָיְתָה לוֹ בְּאֵר אוֹ בּוֹר בַּחֲצֵרוֹ בֵּין שֶׁיֵּשׁ בּוֹ מַיִם בֵּין שֶׁאֵין בּוֹ מַיִם חַיָּב לַעֲשׂוֹת חֻלְיָא גְּבוֹהָה עֲשָׂרָה טְפָחִים. אוֹ לַעֲשׂוֹת לָהּ כִּסּוּי כְּדֵי שֶׁלֹּא יִפּל בָּהּ אָדָם וְיָמוּת. וְכֵן כָּל מִכְשׁל שֶׁיֵּשׁ בּוֹ סַכָּנַת נְפָשׁוֹת מִצְוַת עֲשֵׂה לַהֲסִירוֹ וּלְהִשָּׁמֵר מִמֶּנּוּ וּלְהִזָּהֵר בַּדָּבָר יָפֶה יָפֶה. שֶׁנֶּאֱמַר (דברים ד ט) "הִשָּׁמֶר לְךָ וּשְׁמֹר נַפְשְׁךָ". וְאִם לֹא הֵסִיר וְהֵנִיחַ הַמִּכְשׁוֹלוֹת הַמְּבִיאִין לִידֵי סַכָּנָה בִּטֵּל מִצְוַת עֲשֵׂה וְעָבַר בְּ(דברים כב ח) "לֹא תָשִׂים דָּמִים":
There is no difference between a roof or anything else that is dangerous and likely to cause death to a person who might stumble. If, for instance, one has a well or a pit in his courtyard — — he must build an enclosing ring ten handbreadths high, or put a cover over it, so that a person should not fall into it and die. So too, any obstruction that is a danger to life must be removed as a matter of positive duty and extremely necessary caution.
הַרְבֵּה דְּבָרִים אָסְרוּ חֲכָמִים מִפְּנֵי שֶׁיֵּשׁ בָּהֶם סַכָּנַת נְפָשׁוֹת. וְכָל הָעוֹבֵר עֲלֵיהֶן וְאוֹמֵר הֲרֵינִי מְסַכֵּן בְּעַצְמִי וּמַה לַּאֲחֵרִים עָלַי בְּכָךְ אוֹ אֵינִי מַקְפִּיד בְּכָךְ מַכִּין אוֹתוֹ מַכַּת מַרְדּוּת:
The sages have prohibited many things because they are dangerous to life. If anyone disregards them and says : "What claim have others on me if I risk my own life?" or: "I do not mind this," he should be lashed for disobedience.
(כ) ועד כאן דברתי מצד יושר ההנהגה שראוי לאדם להרחיק מזה ועכשיו אני אומר אפילו איסורא איכא שהרי כל העוסקים בזה צריכין להכנס ביערות ולהכניס עצמם בסכנות גדולות במקום גדודי חיות ורחמנא אמר ונשמרתם מאוד לנפשותיכם, ומי לנו גדול ואומן בקי בצידה יותר מעשו שהכתוב העיד עליו ויהי עשו איש יודע ציד וכו' ופוק חזי מה אמר הוא על עצמו הנה אנכי הולך למות וגו' ואין מקרא יוצא מידי פשוטו שהיינו שהוא מסתכן בכל יום בין גדודי חיות וכן פירשו הרמב"ן, ומעתה איך יכניס עצמו איש יהודי למקום גדודי חיות רעות ואף גם בזה מי שהוא עני ועושה זו למחייתו לזה התורה התירה כמו כל סוחרי ימים מעבר לים שכל מה שהוא לצורך מחייתו ופרנסתו אין ברירה והתורה אמרה ואליו הוא נושא את נפשו ואמרו רז"ל מפני מה זה עלה בכבש ונתלה באילן ומסר עצמו למיתה לא על שכרו כו', אבל מי שאין עיקר כוונתו למחייתו ומתאות לבו הוא הולך אל מקום גדודי חיות ומכניס עצמו בסכנה הרי זה עובר על ונשמרתם מאוד כו'.
by Yechezkel ben Yehuda HaLevi Landau (8 October 1713 – 29 April 1793)
(20) Thus far I have addressed the aspect of proper behavior, [contending] that man ought to distance himself from [hunting for sport.] Now I say that it is even forbidden, for anyone who engages in this must enter the forests and place themselves in great danger, in places of packs of wild animals. And the Merciful One said: “Take great care of yourselves” (Deut. 4:15). And who was a greater and more expert hunter than Esau, about who Scripture attests: “Esau was a skillful hunter…” (Genesis 25:27). Yet look at what he said about himself: “I am about to die…” (ibid. 32). And no Scripture departs from its plain meaning, which is that he endangers himself each day among packs of wild beasts. So explains Nachmanides. So then how can a Jewish man insert himself into a place of packs of wild and vicious beasts? Yet even here, if one who is poor and does so for sustenance, the Torah permitted it, like any maritime trader crosses the sea—for with regard to anything that is for the needs of one’s sustenance and livelihood, there is no choice. The Torah has said [about the wages of a day laborer]: “His life depends on it” (Deuteronomy 24:15). And the sages said (Bava Metzia 112a): “Why did this person ascend a ramp, dangle from a tree, and place himself at risk of death? Is it not for his wages?” But one whose main intention is not for sustenance, rather, he goes to the place of packs of wild animals due to his heart’s appetite, and endangers himself, violates “Take great care of yourselves.” (Deuteronomy 4:15)
וְנִשְׁמַרְתֶּ֥ם מְאֹ֖ד לְנַפְשֹׁתֵיכֶ֑ם כִּ֣י לֹ֤א רְאִיתֶם֙ כָּל־תְּמוּנָ֔ה בְּי֗וֹם דִּבֶּ֨ר יְהוָ֧ה אֲלֵיכֶ֛ם בְּחֹרֵ֖ב מִתּ֥וֹךְ הָאֵֽשׁ׃
For your own sake, therefore, be most careful—since you saw no shape when the LORD your God spoke to you at Horeb out of the fire—
פֶּ֨ן־תַּשְׁחִת֔וּן וַעֲשִׂיתֶ֥ם לָכֶ֛ם פֶּ֖סֶל תְּמוּנַ֣ת כָּל־סָ֑מֶל תַּבְנִ֥ית זָכָ֖ר א֥וֹ נְקֵבָֽה׃
not to act wickedly and make for yourselves a sculptured image in any likeness whatever: the form of a man or a woman,
רַ֡ק הִשָּׁ֣מֶר לְךָ֩ וּשְׁמֹ֨ר נַפְשְׁךָ֜ מְאֹ֗ד פֶּן־תִּשְׁכַּ֨ח אֶת־הַדְּבָרִ֜ים אֲשֶׁר־רָא֣וּ עֵינֶ֗יךָ וּפֶן־יָס֙וּרוּ֙ מִלְּבָ֣בְךָ֔ כֹּ֖ל יְמֵ֣י חַיֶּ֑יךָ וְהוֹדַעְתָּ֥ם לְבָנֶ֖יךָ וְלִבְנֵ֥י בָנֶֽיךָ׃
But take utmost care and watch yourselves scrupulously, so that you do not forget the things that you saw with your own eyes and so that they do not fade from your mind as long as you live. And make them known to your children and to your children’s children:
כָּל הַמַּנְהִיג עַצְמוֹ בִּדְרָכִים אֵלּוּ שֶׁהוֹרִינוּ אֲנִי עָרֵב לוֹ שֶׁאֵינוֹ בָּא לִידֵי חֹלִי כָּל יָמָיו עַד שֶׁיַּזְקִין הַרְבֵּה וְיָמוּת וְאֵינוֹ צָרִיךְ לְרוֹפֵא. וְיִהְיֶה גּוּפוֹ שָׁלֵם וְעוֹמֵד עַל בֻּרְיוֹ כָּל יָמָיו. אֶלָּא אִם כֵּן הָיָה גּוּפוֹ רַע מִתְּחִלַּת בְּרִיָּתוֹ. אוֹ אִם הָיָה רָגִיל בְּמִנְהָג מִן הַמִּנְהָגוֹת הָרָעִים מִתְּחִלַּת מוֹלַדְתּוֹ. אוֹ אִם תָּבוֹא מַכַּת דֶּבֶר אוֹ מַכַּת בַּצֹּרֶת לָעוֹלָם:
Whoever conducts himself in the ways which we have drawn up, I will guarantee that he will not become ill throughout his life, until he reaches advanced age and dies. He will not need a doctor. His body will remain intact and healthy throughout his life.[One may rely on this guarantee] unless [his body] was impaired from the birth, he was accustomed to one of the harmful habits from birth, or should there be a plague or a drought in the world.
לְעוֹלָם יִמְנַע אָדָם עַצְמוֹ מִפֵּרוֹת הָאִילָנוֹת. וְלֹא יַרְבֶּה מֵהֶן וַאֲפִלּוּ יְבֵשִׁין וְאֵין צָרִיךְ לוֹמַר רְטֻבִּים. אֲבָל קֹדֶם שֶׁיִּתְבַּשְּׁלוּ כָּל צָרְכָּן הֲרֵי הֵן כַּחֲרָבוֹת לַגּוּף. וְכֵן הַחֲרוּבִים רָעִים לְעוֹלָם. וְכָל הַפֵּרוֹת הַחֲמוּצִין רָעִים וְאֵין אוֹכְלִין מֵהֶן אֶלָּא מְעַט בִּימוֹת הַחַמָּה וּבַמְּקוֹמוֹת הַחַמִּים. וְהַתְּאֵנִים וְהָעֲנָבִים וְהַשְּׁקֵדִים לְעוֹלָם טוֹבִים בֵּין רְטֻבִּין בֵּין יְבֵשִׁין וְאוֹכֵל אָדָם מֵהֶם כָּל צָרְכּוֹ. וְלֹא יַתְמִיד אֲכִילָתָם אַף עַל פִּי שֶׁהֵן טוֹבִים מִכָּל פְּרִי הָאִילָנוֹת:
One should always avoid fruits. He should not eat of them in quantity even [when] dried and, it goes without saying [when they are] fresh. When they are not sufficiently ripe, they are like swords to the body. Carobs, too, are always harmful.All pickled fruits are harmful and should be eaten only sparingly in summer weather and in hot climates. Figs, grapes and almonds are always beneficial, both fresh and dried. One may eat of them as much as he requires. However, he should not eat them constantly even though they are the most beneficial of fruits.
דְּבָרִים הַמְשַׁלְשְׁלִין אֶת בְּנֵי מֵעַיִם כְּגוֹן עֲנָבִים וּתְאֵנִים וְתוּתִים וַאֲגַסִּים וַאֲבַטִּיחִים וּמִינֵי הַקִּשּׁוּאִים וּמִינֵי מְלָפְפוֹנוֹת אוֹכֵל אוֹתָם הָאָדָם בַּתְּחִלָּה קֹדֶם אֲכִילָה. וְלֹא יְעָרְבֵם עִם הַמָּזוֹן. אֶלָּא שׁוֹהֶה מְעַט עַד שֶׁיֵּצְאוּ מִבֶּטֶן הָעֶלְיוֹן וְאוֹכֵל מְזוֹנוֹ. וּדְבָרִים שֶׁמְּאַמְּצִין אֶת בְּנֵי מֵעַיִם כְּגוֹן רִמּוֹנִים וּפְרִישִׁים וְתַפּוּחִים וּקְרוֹסְטוֹמוֹלִין אוֹכֵל אוֹתָן תֵּכֶף לִמְזוֹנוֹ. וְלֹא יַרְבֶּה לֶאֱכל מֵהֶן:
Laxative foods such as grapes, figs, mulberries, pears, melons, certain types of cucumbers and certain types of zucchini should be eaten first, before the meal. One should not eat them together with his main meal. Rather, he should wait until they have descended from the upper stomach and [then] eat his meal.Foods which are constipating, such as pomegranates, quinces, apples, and crustumenian pears should be eaten immediately after the meal and not in quantity.
הוֹאִיל וֶהֱיוֹת הַגּוּף בָּרִיא וְשָׁלֵם מִדַּרְכֵי הַשֵּׁם הוּא. שֶׁהֲרֵי אִי אֶפְשָׁר שֶׁיָּבִין אוֹ יֵדַע דָּבָר מִידִיעַת הַבּוֹרֵא וְהוּא חוֹלֶה. לְפִיכָךְ צָרִיךְ לְהַרְחִיק אָדָם עַצְמוֹ מִדְּבָרִים הַמְאַבְּדִין אֶת הַגּוּף. וּלְהַנְהִיג עַצְמוֹ בִּדְבָרִים הַמַּבְרִין וְהַמַּחֲלִימִים. וְאֵלּוּ הֵן: לְעוֹלָם לֹא יֹאכַל אָדָם אֶלָּא כְּשֶׁהוּא רָעֵב. וְלֹא יִשְׁתֶּה אֶלָּא כְּשֶׁהוּא צָמֵא. וְאַל יַשְׁהֵא נְקָבָיו אֲפִלּוּ רֶגַע אֶחָד. אֶלָּא כָּל זְמַן שֶׁצָּרִיךְ לְהַשְׁתִּין אוֹ לְהָסֵךְ אֶת רַגְלָיו יַעֲמֹד מִיָּד:
Since maintaining a healthy and sound body is among the ways of God - for one cannot understand or have any knowledge of the Creator, if he is ill - therefore, he must avoid that which harms the body and accustom himself to that which is healthful and helps the body become stronger.They are as follows: a person should never eat unless he is hungry, nor drink unless thirsty. He should never put off relieving himself, even for an instant. Rather, whenever he [feels the] need to urinate or move his bowels, he should do so immediately.
אֲפִילּוּ הַמֶּלֶךְ שׁוֹאֵל בִּשְׁלוֹמוֹ לֹא יְשִׁיבֶנּוּ. אָמַר רַב יוֹסֵף, לֹא שָׁנוּ אֶלָּא לְמַלְכֵי יִשְׂרָאֵל, אֲבָל לְמַלְכֵי אוּמּוֹת הָעוֹלָם — פּוֹסֵק. מֵיתִיבִי: הַמִּתְפַּלֵּל וְרָאָה אַנָּס בָּא כְּנֶגְדּוֹ, רָאָה קָרוֹן בָּא כְּנֶגְדּוֹ — לֹא יְהֵא מַפְסִיק, אֶלָּא מְקַצֵּר וְעוֹלֶה! לָא קַשְׁיָא, הָא דְּאֶפְשָׁר לְקַצֵּר (יְקַצֵּר. וְאִם לָאו — פּוֹסֵק). תָּנוּ רַבָּנַן: מַעֲשֶׂה בְּחָסִיד אֶחָד שֶׁהָיָה מִתְפַּלֵּל בַּדֶּרֶךְ. בָּא הֶגְמוֹן אֶחָד וְנָתַן לוֹ שָׁלוֹם, וְלֹא הֶחְזִיר לוֹ שָׁלוֹם. הִמְתִּין לוֹ עַד שֶׁסִּייֵּם תְּפִלָּתוֹ. לְאַחַר שֶׁסִּייֵּם תְּפִלָּתוֹ, אָמַר לוֹ: רֵיקָא, וַהֲלֹא כָּתוּב בְּתוֹרַתְכֶם ״רַק הִשָּׁמֶר לְךָ וּשְׁמֹר נַפְשְׁךָ״, וּכְתִיב ״וְנִשְׁמַרְתֶּם מְאֹד לְנַפְשֹׁתֵיכֶם״. כְּשֶׁנָּתַתִּי לְךָ שָׁלוֹם לָמָּה לֹא הֶחְזַרְתָּ לִי שָׁלוֹם? אִם הָיִיתִי חוֹתֵךְ רֹאשְׁךָ בְּסַיִיף, מִי הָיָה תּוֹבֵעַ אֶת דָּמְךָ מִיָּדִי?! אָמַר לוֹ: הַמְתֵּן לִי עַד שֶׁאֲפַיֶּיסְךָ בִּדְבָרִים. אָמַר לוֹ: אִילּוּ הָיִיתָ עוֹמֵד לִפְנֵי מֶלֶךְ בָּשָׂר וָדָם, וּבָא חֲבֵרְךָ וְנָתַן לְךָ שָׁלוֹם — הָיִיתָ מַחֲזִיר לוֹ?! אָמַר לוֹ: לָאו. וְאִם הָיִיתָ מַחֲזִיר לוֹ, מָה הָיוּ עוֹשִׂים לְךָ? אָמַר לוֹ: הָיוּ חוֹתְכִים אֶת רֹאשִׁי בְּסַיִיף. אָמַר לוֹ: וַהֲלֹא דְּבָרִים קַל וָחוֹמֶר, וּמָה אַתָּה שֶׁהָיִיתָ עוֹמֵד לִפְנֵי מֶלֶךְ בָּשָׂר וָדָם, שֶׁהַיּוֹם כָּאן וּמָחָר בַּקֶּבֶר — כָּךְ אֲנִי שֶׁהָיִיתִי עוֹמֵד לִפְנֵי מֶלֶךְ מַלְכֵי הַמְּלָכִים הַקָּדוֹשׁ בָּרוּךְ הוּא, שֶׁהוּא חַי וְקַיָּים לָעַד וּלְעוֹלְמֵי עוֹלָמִים — עַל אַחַת כַּמָּה וְכַמָּה. מִיָּד נִתְפַּיֵּיס אוֹתוֹ הֶגְמוֹן, וְנִפְטַר אוֹתוֹ חָסִיד לְבֵיתוֹ לְשָׁלוֹם.
Even if the king greets him while he is praying, he should not respond to him as one may not interrupt his prayer. In limiting application of this principle, Rav Yosef said: They only taught this mishna with regard to kings of Israel, as a Jewish king would understand that the individual did not fail to respond to his greeting due to disrespect for the king. However, with regard to kings of the nations of the world, he interrupts his prayer and responds to their greeting due to the potential danger. The Gemara raised an objection to Rav Yosef’s statement: One who is praying and saw a violent person, feared by all, coming toward him, or a carriage coming toward him and he is in the way, he should not stop his prayer but rather abridge it and move out of the way. The Gemara responds: This is not difficult. Rather, this that teaches to abridge one’s prayer rather than stopping, refers to a case where it is possible to abridge his prayer and complete it in time, in which case he should abridge it. And if it is not a situation where he can abridge his prayer, he interrupts his prayer. The Sages taught: There was a related incident, involving a particular pious man who was praying while traveling along his path when an officer [hegmon] came and greeted him. The pious man did not pause from his prayer and did not respond with a greeting. The officer waited for him until he finished his prayer. After he finished his prayer, the officer said to him: You good for nothing. You endangered yourself; I could have killed you. Isn’t it written in your Torah: “Take utmost care and guard yourself diligently” (Deuteronomy 4:9)? And it is also written: “Take therefore good heed unto yourselves” (Deuteronomy 4:15)? Why did you ignore the danger to your life? When I greeted you, why did you not respond with a greeting? Were I to sever your head with a sword, who would hold me accountable for your spilled blood? The pious man said to him: Wait for me until I will appease you with my words. He said to him: Had you been standing before a flesh and blood king and your friend came and greeted you, would you return his greeting? The officer said to him: No. The pious man continued: And if you would greet him, what would they do to you? The officer said to him: They would cut off my head with a sword. The pious man said to him: Isn’t this matter an a fortiori inference? You who were standing before a king of flesh and blood, of whom your fear is limited because today he is here but tomorrow he is in the grave, would have reacted in that way; I, who was standing and praying before the Supreme King of kings, the Holy One, Blessed be He, Who lives and endures for all eternity, all the more so that I could not pause to respond to someone’s greeting. When he heard this, the officer was immediately appeased and the pious man returned home in peace.