(א) 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.
(1) Seeing that the maintenance of the body in a healthy and sound condition is a God-chosen way, for it is impossible that one should understand or know aught of the divine knowledge concerning the Creator when he is sick, it is necessary for man to distance himself from things which destroy the body, and accustom himself in things which are healthful and life-imparting.
רביעיות יושב ומשחק עם לויתן שנאמר (תהלים קד, כו) לויתן זה יצרת לשחק בו
During the fourth three hours, He sits and makes sport with the leviathan, as it is stated: “There is leviathan, whom You have formed to sport with” (Psalms 104:26).
(Rav Soloveitchik explained this Gemara as a source for people to not be too serious and stressed that people calm down if they get insulted)
The Master said in the baraita: If a woman giving birth were to need a lamp, her friend would light the lamp for her on Shabbat. The Gemara asks: This is obvious. The Gemara answers: It is necessary to teach this halakha only in the case of a blind woman giving birth. Lest you say: Since she cannot see even with the light it is prohibited to bring a lamp for her, it teaches us that lighting the lamp is permitted to settle her mind. The blind woman thinks: If there is something that needs to be done in the course of childbirth, the lamp will enable my friend to see and she will do it for me.