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How do we know if we're truly acting for the sake of heaven? Yosef's 33-word moral rebuke to Potiphar's wife reveals that betraying trust and violating integrity expose self-deception masquerading as religious conviction. Tamar's willingness to forfeit her life rather than humiliate Yehuda proves genuine l'shem shamayim demands moral courage, not rationalization.
Rabbi Zweig opens with a striking contradiction in Rashi (רש"י): Potiphar's wife is called a "chayah ra'ah" (evil animal) by Yaakov's prophetic insight, yet Rashi also says she acted "l'shem shamayim" (for the sake of heaven) because she saw in astrological signs that she and Yosef would have descendants. How can someone be an evil animal and simultaneously act for heaven's sake? This tension frames the entire shiur's exploration of authentic versus self-deceptive religiosity. The answer emerges from Yosef's response to her seduction. Before invoking the Noahide prohibition against adultery, Yosef devotes 33 words to a moral argument: "My master trusts me completely. He has withheld nothing from me except you, his wife. To betray this trust would be horrendous, despicable, a violation of every principle of integrity and decency." Only after establishing the moral bankruptcy of the act does Yosef add, "and I would sin to God." Rabbi Zweig explains that this sequence is deliberate and essential. When someone convinces themselves they're acting for heaven's sake—as Potiphar's wife did with her astrological rationalization—theological arguments are useless. She could always claim divine exception or prophetic mandate. The only way to penetrate such self-delusion is to force a confrontation with the act's fundamental immorality.
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Vayeishev 37-39
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