John Chrysostom
Christ could certainly have said, "I have performed greater miracles than Moses. I had no need of a rod, nor any need of prayer, but accomplished everything by Myself. And if you recall the manna, behold, I too have given you bread."
But it was not then the time to say this. His one concern was to turn them toward spiritual food. See with what boundless wisdom Christ answers them: "Moses did not give you the bread from heaven, but My Father gives you the true bread from heaven."
Why did He not say, "Moses did not give it, but I do"? Why did He point to God instead of Moses, and to Himself instead of the manna? Because the weakness of His hearers was great, as is clear from what follows.
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Even when He said these very words, He did not stop them. Although at the beginning He had said, "You seek Me, not because you saw signs, but because you ate the loaves and were filled," and although He corrected them in the words that followed, still they did not cease demanding bread.
When Christ promised to give water to the Samaritan woman, He did not mention the Father. He simply said, "If you knew who it is that says to you, 'Give Me a drink,' you would have asked Him, and He would have given you living water."
And again He said, "The water that I shall give" (Jn 4:10, 14), and He does not refer her to the Father. Here, however, He mentions the Father, so that you may know how great the Samaritan woman's faith was, and how great the Jews' weakness was.
But the manna was not from heaven; how then is it said, "from heaven"? In the same way Scripture says, "the birds of heaven," and again, "the Lord thundered from heaven" (Ps 8:9; Ps 17:14).
He calls that bread true, not because the miracle of the manna was false, but because it was an image and not the truth itself. Having mentioned Moses, He did not set Himself against him, because the Jews did not yet prefer Him to Moses.
On the contrary, they held a higher opinion of Moses than of Him. Therefore, after saying, "Moses did not give it," He did not add, "I give it." Instead He said, "The Father gives."