For before Him there are no barriers or deficiencies. His unique perfection surely lies in His total and absolute power. No possible barrier or deficiency can stand in His way. This we will come to know from the side of God’s perfection, not from the opposite side. For this is revealed only when it is not the deficiencies and the repair that comes to them through the power of His perfection that are seen, but rather when only His perfection is seen. This was a suitable area within which service could exist. His plan to reveal His oneness in actuality consisted of first revealing the deficiencies, and then rectifying them, thus revealing His oneness and His power over everything.
God's Perfection and Why We Experience Deficiency
Kalach Pitchei Chokhmah 4:6