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Why does Tosfos reject the Gemara (גמרא)'s kal v'chomer from bracha acharona to bracha rishona, given that bracha rishona is only derabbanan? The shiur distinguishes between bracha as de'oraysa permission to benefit from the world versus bracha as rabbinic fulfillment with intrinsic value. This framework explains how a ba'al keri can eat without bracha rishona by intending to fulfill the permission requirement through birkat hamazon.
Rabbi Zweig delivers an in-depth analysis of a complex Tosfos on Berachos 35a that questions the Gemara (גמרא)'s kal v'chomer argument regarding brachos. The discussion centers on understanding why Tosfos says the kal v'chomer from bracha acharona to bracha rishona is 'not really a kal v'chomer' given that we know from the Mishna about a ba'al keri that bracha rishona is only derabbanan. The shiur develops a fundamental distinction between two possible functions of brachos. The first is the de'oraysa requirement for some form of 'mater' (permission) before benefiting from this world, based on the principle 'asur la'adam she'yitnaeh min ha'olam hazeh b'lo bracha' (it is forbidden for a person to benefit from this world without a bracha). The second is the rabbinic institution of bracha as a 'kium' - a positive fulfillment with intrinsic value, such as an act of 'hillul' (making something mundane permissible through recognition of Hashem (ה׳)).
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Berachos 35a
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Should one learn Torah full-time trusting in Divine providence, or combine learning with work? The shiur distinguishes between Rabbi Shimon ben Yochai's approach of complete separation from worldly concerns versus Rabbi Shmuel's view that proper work itself becomes part of Torah. The key insight: true emunah means learning without demanding sustenance from either Hashem or community, unlike having a 'contract' expecting payment for learning.
