He healed others by a word. … But the Lord bestowed sight on the one who was blind from birth – not by a word, but by an outward action. He did this neither casually nor simply because this was how it happened. He did it this way in order to show it was the same hand of God here that had also formed man at the beginning. And therefore when His disciples asked Him why he had been born blind, whether by his own fault or his parents’, Jesus said, “Neither this man sinned, nor his parents, but that the works of God might be manifested in him.” The work of God is, after all, the forming of man. He did this by an outward action, as Scripture says, “And the Lord took clay from earth, and formed man.” Notice here too how the Lord spit on the earth, and made clay and smeared it on his eyes, showing how the ancient creation was made. He was making clear to those who can understand, that this was the hand of God through which man was formed from clay. For what the creating Word had neglected to form in the womb, this He supplied openly. He did this so that the works of God might be evident in Him, and so that we would now seek for no other hand than that through which humanity was formed. Nor should we seek another Father, knowing that the hand of God which formed us in the beginning, and forms in the womb, has in the last times sought us lost ones out. He is gaining his own lost sheep and putting it on his shoulders and joyfully restoring it to the fold of life.
St. Irenaeus of Lyons