The Torah says: ‘In Sukkot you shall dwell for seven days… so that your generations shall know, that I hosted the children of Israel in Sukkot when I brought them forth from the land of Egypt… [Vayikra / Leviticus 23]

One of the reasons why we build and live in the Sukkah is to remember the clouds of glory with which Hashem protected us when we were traveling in the desert after the exodus from Egypt. Living with this idea ,believing in G-d’s constant protection, allows us to live a more serene life.