Rabbi Aronow related: There was a group of children that had a magid shiur that gave them a daily shiur. Every day he would give a shiur for exactly two hours. Always it worked out perfectly, that when the shiur finished, it was just the end of the 2 hours. (I don't remember if he said so explicitly, but the mashmo'us was that he was one of the children). One day, the shiur finished early. The talmidim assumed that he miscalculated that day, realizing that it's very hard to plan it out that the shiur should end after exactly 2 hours. But a moment later Reb Nissan came in, and they realized that it was planned in advance, that the shiur should finish early so that Reb Nissan could farbreng with them. Reb Nissan started off the farbrenging by "justifying" how they ended the shiur early for a farbrengen. He told them, it says in the gemoro מבטלין ת"ת להוצאת המת ולהכנסת כלה. He explained that hoitzoas hames is taking out the yetzer hora, and hachnosas kala is bring it ahavas Hashem, and both of these are what are accomplished by a chassidishe farbrengen.