John Chrysostom
He acted in the same way with Nathanael, saying: "Because I said to you, I saw you under the fig tree, do you believe? You will see greater things than these" (Jn 1:50). He did so also with Nicodemus: "No one has ascended into heaven except the Son of Man who is in heaven" (Jn 3:13).
What then? Does He add new perplexities to perplexities? By no means. Rather, by the greatness and number of the doctrines, He wishes to hold them close to Himself.
If He had simply said, "I came down from heaven," and added nothing more, He would have scandalized them sooner. But when He says, "My body is the life of the world," and also, "As the living Father sent Me, and I live because of the Father," and again, "I came down from heaven," He thereby resolves their perplexity.
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One who says only one great thing about himself can, of course, still be suspected of lying. But one who, after that, declares so many things removes every suspicion.
He does and says all this to remove them from the thought that Joseph is His father. Therefore He did not speak in this way to increase the scandal, but to destroy it.
Whoever considered Him Joseph's son would not accept His words. But whoever was convinced that He came down from heaven and would ascend there again could more readily give heed to His words.