John Chrysostom
"They asked him: How were your eyes opened?" He answers, "The Man called Jesus." What are you saying? Is it for a man to do such deeds? But he did not yet know anything great about Him.
"The Man called Jesus made clay and anointed my eyes." See how truthful he is. He did not say from what He made the clay. What he does not know, he does not say. He did not see that Christ spat on the ground. But that He anointed him, he knew by feeling and touch.
"And He said to me: Go to the pool of Siloam and wash." His hearing told him this. But how did he know His voice? From His conversation with the disciples. Thus he relates all this on the basis of the witness of the deed itself, and yet he cannot say the manner of the healing.
If faith is needed even in relation to what is sensible and touched, much more is it needed in relation to the invisible.