This power of destruction prevents what exists from enduring in a state of complete perfection, causing it to go through cycles of creation and destruction. Sometimes the power of creation gains strength and endures for a long period, sometimes the opposite is the case, and the power of destruction attacks and destroys what exists. But when the time comes for complete perfection to emerge and for the giving of this law that will cause what exists to attain complete perfection, this will totally negate evil. The creations themselves will then also include components that are not present in them now, corresponding to and revealing this perfection.
The Power of Destruction That Keeps Things Imperfect
Kalach Pitchei Chokhmah 37:11