The Yetzer Hora and the Blatt Gemora

The Pnei Menachem would often repeat a saying he had heard in his youth from elder chassidim. The yetzer hora likes to accompany us wherever we go. He follows us when we have a gathering or a farbrengen, when we have a seudah, when we study Chumash with Rashi, when we study Mishnayos, and when we study Medrash. But when a person studies a blatt Gemora with Tosafos, there the yetzer hora gets erased.