After the somberness of the High Holidays comes Sukkot, known as zman simchateinu, “the time to be happy.” Once our slate is wiped clean, we begin a new year in purity and therefore it is only natural for us to rejoice. The Sfat Emet writes that the amount of joy a person feels at sukkot is related to the amount of effort they put in to Rosh Hashana and Yom Kippur, the time leading up to Sukkot. In other words, the joy we feel is not a result of the High Holidays but an outcome of the process of going through the High Holidays in the proper manner.