Thus …only His Will… – the Will of the Emanator, the unified Eyn Sof, blessed be His Name – …exists… because only God exists of necessity. In other words, just as we must believe in the oneness of God’s existence – that God alone exists of necessity – so we must believe in the oneness of His power and will. Just as His existence is necessary, and it cannot be otherwise – and He alone is the necessary cause, while everything else derives from Him – so too, His will and power are necessary, and it cannot be otherwise. His power alone holds sway, and all other wills exist only in accordance with this Will. Thus …no other will exists except through Him.
Blessing of His
Kalach Pitchei Chokhmah 1:13