I had the privilege of learning in Rav Herschel Schachter’s shiur at Yeshiva University for four years, in the days before he was universally recognized as one of the outstanding Torah sages. His impact on my learning is immeasurable. One of the most striking things I learned in his shiur is how to say, “I don’t know”. We learned that there is no embarrassment in not knowing – even for great scholars. This humility is a most important, yet often lacking, trait in many a Torah (or any other) scholar.