John Chrysostom
“And lifting up His eyes, and seeing a great multitude.” Here the evangelist shows that He never sat idly with the disciples, but was expounding something to them.
He was probably teaching with special fullness and drawing them to Himself. From this one may see what care He had for them, and how meekly and condescendingly He dealt with them.
As they sat with Him, they were probably looking at one another. Then Christ, looking up, sees the people coming to Him.
The other evangelists say that the disciples came to Him and asked and entreated Him not to send the people away hungry (Mt 14:15; Lk 9:12). John notes that Christ put the question about this to Philip.
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It seems to me that both are true. They did not happen at the same time, but one preceded the other. Thus one account gives it one way, and the other another way.
Why, then, does He ask Philip? Because He knew which of His disciples most needed instruction. This is the same Philip who later said, “Show us the Father, and it is enough for us” (Jn 14:8).
For this reason Christ instructs him beforehand. If the miracle had taken place without preparation, it would not have appeared so wondrous.
But now Christ first moves Philip to confess that there is scarcity of food. Having recognized how great the scarcity was, he would better understand the greatness of the miracle that was to be accomplished.
This is what Christ says to Philip: “Where shall we buy bread, that these may eat?” So also in the Old Testament God spoke to Moses, and did not perform the miracle before asking him, “What is that in your hand?” (Ex 4:2).
Since unusual events that happen unexpectedly usually cause what preceded them to be forgotten, God first bound Moses by an acknowledgment of his present condition.
Then, when later struck with wonder, he could not forget what he himself had confessed. Thus, by comparing the one with the other, he would know the greatness of the miracle. The same thing happens here.