2 Lo, first open your eyes to that which is said; “I have come,” says He, “to do the works of Him That sent Me.” Now here at once stands forth the Arian, and says, “Here you see that Christ did not His Own works, but the Father's who sent Him.” Would he say this, if he saw, that is, if he had washed his face in Him who was sent, as it were in Siloa? What then do you say? “Lo,” says he, “Himself said it.” What said He? “I have come to do the works of Him That sent Me.” Are they not then His Own? No. What then is that which the Siloa Himself says, the Sent Himself, the Son Himself, the Only Son Himself, whom you complain of as degenerate? What is that He says, “All things that the Father has are Mine.” You say that He did the works of Another, in that He said, “I must do the works of Him That sent Me.” I say that the Father had the things of another: I am speaking according to your principles. Why would you object to me that Christ said, “I have come to do His works” as if, “not My own but 'His That sent Me'”?
Source: Sermons on Selected Lessons of the New Testament (New Advent)