There are two contradictory elements in the sukkah. On one hand, a sukkah is by definition a temporary dwelling, as our Sages say, For seven days go out of your permanent dwelling and dwell in a temporary one. On the other hand, For seven days a person makes his sukkah his permanent dwelling and his house his temporary one.

This world is a sukkah, a temporary dwelling, only a vestibule to the next world. A person must recognize that earthly matters in and of themselves are only temporary. However, when uses them for the sake of Heaven, he makes his "sukkah" an abode for Divinity. The world and everything in it is converted to a permanent dwelling for G‑d.

From the teachings of the Lubavitcher Rebbe