John Chrysostom
Since it was madness to demand the testimony of words when His works proclaimed Him, hear how He answers them. Partly He shows that they ask this needlessly and not in order to learn. Partly He shows that He has already given an answer clearer than words, namely, an answer in deeds.
"I told you, and you do not believe," He says. "The works that I do in My Father's name, they bear witness of Me" (Jn 10:25).
Even the more moderate among them often said this among themselves: "How can a sinful man do such signs?" (Jn 9:16). Again, "A demon cannot open the eyes of the blind" (Jn 10:21). And also, "No one can do such signs unless God is with him" (Jn 3:2).
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Seeing the signs that He did, some said, "This is the Christ" (Jn 7:41). Others said, "When the Christ comes, will He do more signs than this Man has done?" (Jn 7:31).
These very men who were now questioning Him also wished to believe in Him on the basis of works, saying, "What sign do You give, that we may see and believe You?" (Jn 6:30).
Since at that time they made a show of being persuaded by a simple word, though they had not been persuaded by so many works, He exposes their malice. If you do not believe the works, how will you believe words? Therefore your question is needless.