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Why couldn't Yaakov believe his sons when they finally told the truth about Yosef? The Gemara (גמרא) teaches that liars aren't believed even when telling the truth—but only when they deceive themselves (badoi), not merely others (shakran). The shiur explores how self-delusion corrupts relationships, parenting, and entire societies, making us impervious to correction and morally dangerous.
The shiur opens with the dramatic moment in Parshas Vayigash when Yosef's brothers tell Yaakov that Yosef is alive and rules over Egypt. Bereishis 45:26 records that Yaakov's heart "turned" (vayafag libo) because he could not believe them. Avos D'Rabbi Nasan explains that this was the punishment of a liar—even when liars tell the truth, they are not believed. Rabbi Zweig asks two questions: First, if truth is self-evident (nikar mendivrey emes), as the Gemara (גמרא) in Sotah 9b teaches regarding Shimshon and Delilah, how could Yaakov not sense the truth? Delilah knew when Shimshon was finally telling the truth about his strength being in his hair; surely Yaakov should have sensed his sons' truthfulness. Second, how can we reconcile the Torah (תורה)'s description of Potiphar's wife? When Yaakov says "a wild beast devoured him," Rashi (רש"י) explains this was a prophetic vision referring to Potiphar's wife attempting to seduce Yosef—yet elsewhere, Rashi states she acted "for the sake of Heaven" (l'shem Shamayim), like the righteous Tamar. Rabbi Zweig distinguishes between two Hebrew words for liar: shakran (one who consciously lies) and badoi (one who fabricates a reality and believes his own lies). A shakran knows he is lying and can therefore be detected through subtle cues—speech patterns, vibrations, or inconsistencies that sensitive people or lie detectors can pick up. Shimshon was a shakran; Delilah could sense when he finally told the truth because the deceptive "vibrations" disappeared. A badoi, however, has convinced himself that his fabrication is true. He lives in a made-up reality so completely that he exhibits no tell-tale signs of lying. When he speaks, he is emotionally telling "the truth"—his truth—even if it is objectively false. This is why the punishment of a badoi is that even when he tells the objective truth, nobody can believe him—there is no way to distinguish his truthful statements from his delusional ones.
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Bereishis 45:26 (Parshas Vayigash)
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