Shiur from Rabbi Elimelech Kohn Ztl on סוכות.  Discussed:   The Bach teaches that there are three Mitzvos that have a special requirement to know the reason behind the Mitzvah in order to fully satisfy the obligation; Sukkos, Tefilin and Tzisis. Is there a reason why these Mitzvos are unique in this regard?  The Sefer Haikram writes that there are three basic fundamental principles of belief, and they correspond to the three Yomim Tovim of Pesach, Shavous, and Sukkos.