Now the root of all this above lies in the Line and the Residue, as stated earlier. The Residue (the root of the body) is a certain measure born out of the concealment of God’s perfection and unity, upon which all the different aspects of judgment, including all the different aspects of evil, as explained above, depend (see Opening 27). This is the way the worlds were created. This is not an aspect of perfection; on the contrary, it is the concealment of perfection. Clearly, the complete perfection of the Supreme Will is far away from this, and His perfect light does not reach it in a manifest way.
The Reshimu as Root of the Physical World
Kalach Pitchei Chokhmah 41:7