The Torah talks only about how to unite all the souls together and mend them into a single soul. It is written, “I created the evil inclination, and I created the Torah for its correction because the Light in it Reforms.”
The Light of the Torah returns us to a single desire. The whole narration of the Torah is devoted exclusively to describing the process of unification among the souls. The Torah talks about the forms of connection between parts of ZON (Zeir Anpin and Nukvah) in all spiritual states. Therefore, the Light from these states of connection restores the connections between us and returns us to the source: the Creator.
It is difficult to imagine how unification of a single soul’s fragments can be elucidated so extensively, yet, the whole Torah tells us only about this. Although the Light of the Torah comes from a single soul, it passes through the systems that were created after its breaking. For this reason, it has adapted to our broken state and has the ability to correct it.
From the 2nd part of the Daily Kabbalah Lesson 6/30/10, The Zohar