Rav Moshe Feinstein used to stay at a certain hotel in the Catskills. The manager of the hotel relates that between mincha and maariv one of the congregants would give a shiur. One time a businessman was asked to give the shiur. The ONLY person who rose in his honor was Reb Moshe. "If he is publicly teaching Torah he deserves respect" explained Rav Moshe.
[Kol Hatorah nissan 5763 page 63]
זכות הצדיקים יעזור ויגן ויושיע