The children of Isael departed from Egypt in Nissan (April), and obtained immediately these booths, which they made use of for forty years. Thus they were in booths during the entire cycle of the year, and we could as easily commemorate this fact in the spring as in the fall, in the summer as in the winter. Why, then, has God made autumn, and neither spring nor summer, the season of observance? Because if we dwelt in booths in the summer, it would be a question whether we did so in obedience to God's behest or for our own gratification; for many people seek airy retreats during this season; but in the fall, when the trees lose their leaves, and the air grows cold and chilling, and it is the time to fix our houses for the winter, then by inhabiting these temporary residences, we display our desire to do as our Creator has bidden us.