The Rebbe offers logical and scientific evidence of the mass revelation at Sinai, and explains how Judaism differs from every religion in its unique ability to prove its foundational principles—namely, that the Torah was given directly by G-d to the Jewish people.

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Original letters and Sichos for this Shiur and many others available here: https://drive.google.com/drive/folders/12ehoGNXfgJTm4xCQKYNRRBW2E0XMscsL?usp=sharing