…and they had to be given a place in which to do what is in their power… This is the whole concept of the six thousand years of the existence of this world. …until they return to a level beyond that of the worlds... i.e. beyond the level of the worlds of Atzilut-Beriyah-Yetzirah-Asiyah. For the lower realms were created with an aspect of damage and defect deriving from BaN, and completion of this branch is delayed until after the creation of evil and the creation of the lower worlds – until evil is repaired by the lower creations, this being their service. This branch (BaN) will then be complete and return to a state of repair like the other branches of Adam Kadmon (the Ears, Nose and Mouth and above).
Repairing the World of Adam
Kalach Pitchei Chokhmah 98:8