Theophylact of Ohrid

He commands the blind man to go to Siloam partly so that the degree of his faith and obedience might be revealed, for he did not reason that there was no need to go to Siloam or to wash if the clay and spittle could make him fully sighted, but obeyed the One who commanded; partly so as to stop the mouths of the foolish Jews, for naturally many watched him as he walked with eyes smeared with clay and looked at him attentively, so that they could not afterward say "it is he" or "it is not he"; and finally, so that by sending him to …

Commentary on John ↗

Irenaeus

As, therefore, we are by the Word formed in the womb, this very same Word formed the visual power in him who had been blind from his birth; showing openly who it is that fashions us in secret, since the Word Himself had been made manifest to men: and declaring the original formation of Adam, and the manner in which he was created, and by what hand he was fashioned, indicating the whole from a part. For the Lord who formed the visual powers is He who made the whole man, carrying out the will of the Father. …

Against Heresies Book V ↗

Augustine of Hippo

He sent him to the pool which is called Siloam. But it was the evangelist's concern to call our attention to the name of this pool; and he adds, "Which is interpreted, Sent." You understand now who it is that was sent; for had He not been sent, none of us would have been set free from iniquity. Accordingly he washed his eyes in that pool which is interpreted, Sent-he was baptized in Christ. If, therefore, when He baptized him in a manner in Himself, He then enlightened him; when He anointed Him, perhaps He made him a catechumen.

Tractates on John 44 ↗

Ambrose of Milan

Why did He Who restored life at command, Who gave health by His word, saying to the dead, "Come forth," and Lazarus came forth from the grave, saying also to the sick of the palsy, "Arise and take up thy bed," and the sick of the palsy rose and himself began to carry his bed, whereon, when all his limbs were paralyzed, he had been wont to be carried; why, I say, did He spit on the ground and make clay, and anoint the eyes of the blind man, and say to him, "Go, wash in the pool of Siloam, which is by interpretation, Sent. …

Letter 80.4-7 ↗

Bonaventure

And he said to him: Go and wash in the pool of Siloam. "Siloam is a spring at the foot of Mount Zion, which does not flow with continuous waters, but bubbles forth at certain hours through the hollows of the earth." And because this was commanded not without mystery, the Evangelist adds the interpretation of the name, saying: Which is interpreted "Sent." Chrysostom: "So that you may learn that there the power of the one who sends is at work." And the power is expressed in its effect; whence he adds: And he went away and washed and …

Commentary on John, Chapter 9 ↗