A Moment with the Rebbe: After meriting a yechidus by the Rebbe, the Rachemstrivker Rebbe remarked, “I saw that the Rebbe was literally ready to discuss any area of Shas, to prove that Chassidus is a necessity in order to grasp the full depth of Torah.”
Reb Nachman Yosef Twersky relates:
When my uncle Reb Itzikel, the Rachemstrivker Rebbe of Borough Park, came to New York for his own chassuna in 5714 (1954), he merited a yechidus.
The Rebbe asked him if they could talk in learning, and he agreed. When the Rebbe inquired which masechta he was learning, he answered that the yeshiva was learning Bava Basra, but he personally was involved in Menachos. Again, the Rebbe asked which masechta he prefers discussing, and he settled on Menachos.
The Rebbe posed a question on a Rosh in Menachos. My uncle answered two classic answers that are brought in the commentaries, and the Rebbe added another two of his own.
Then, the Rebbe demonstrated how each of these four answers has a difficulty, leaving a gaping hole in the sugya. The Rebbe proceeded to explain the inyan in light of Chassidus, through which all the issues were resolved.
My uncle says, “I saw that the Rebbe was literally ready to discuss any area of Shas, to prove that Chassidus is a necessity in order to grasp the full depth of Torah.”
(Shemen Sason Mechaveracha, page 125)