Kinyan 11 Pilpul Talmidim - The Rogatchover Gaon and the Ohr Samei'ach Trade Barbs
When the Rogatchover Gaon and the Ohr Samei'ach once met at a simcha, one of them asked the other a question in learning. The other excitedly responded by just mentioning (for example), Shabbos 45b. The reply was short in coming, but what about the Rambam Halacha... This went on for a long time as they just shouted Mareh Mikomos back and forth to each other citing gemaros, Rishonim and Acharonim with each one "getting it" and not needing to explain. That is how geonim speak to each other.
Rebbi Chanina said, "Harbeh Lamaditi Mei Rabosai", I learned a great deal from my teachers. "U'MeiChaveirai Yoseir MiRabosai", and even more from my friends. "U'MiTalmidai Yoseir Mikulam", and from my students more than all of them (Ta'anis 7a).
Kinyan HaTorah requires leaving no stone unturned even when there seems to be no treasure underneath. Men of maturity and intelligence focus on the places where the treasure is most likely to be found. You can't say the same about students. Put a bunch of them before you in a room and you can be sure that every possible argument, both sound and faulty, will be voiced. After you've been through all of them, dealt with them, and dismissed them you know you found your treasure. A treasure you can hold onto for eternity.