In the Shade of Emunah
Anyone who is a member of the holy nation of Am Yisrael may sit in the sukkah, under the canopy of emunah. And anyone who is not a member of the holy nation must not sit in it and should be removed from under the canopy of emunah.
Anyone who sits under the canopy of emunah gains freedom for himself and for his descendants forever. And anyone who removes himself from under the canopy of emunah gains only exile for himself and for his descendants.
The mitzvah of sitting in the sukkah, as we have explained, is in order to show that Am Yisrael sit under the canopy of emunah, without any fear, for the prosecutors have been removed from them. And anyone [who understands] the secret of emunah sits in the sukkah, as we have explained – anyone [who understands] the secret of emunah and is a member of Am Yisrael shall sit in the sukkah.
(Zohar Hakadosh, Parshas Emor, 103)