Teshuvah is not only an individual affair, a return to one's proper state.
It is rather a return of the Shekhinah itself, that man had pulled down and humiliated, within his own nefesh.
By his repentance, the Shekhinah is restored to its heights.
–Rabbi Adin Steinsaltz
In Learning from the Tanya by Rabbi Adin Steinsaltz