3 But that we may not, by hurrying over these victories, mar your profit, let us begin from the first assault, and examine each with exact care.
Thus, after He was an hungered, it is said, “The tempter came, and said unto Him, If Thou be Son of God, command that these stones be made bread.”
For, because he had heard a voice borne from above, and saying, “This is My beloved Son;” and had heard also John bearing so large witness concerning Him, and after that saw Him an hungered; he was thenceforth in perplexity, and neither could believe that He was a mere man, because of the things spoken concerning Him; nor on the other hand receive it that He was Son of God, seeing Him as he did in hunger. Whence being m perplexity he utters ambiguous sounds. And much as when coming to Adam at the beginning, he feigns things that are not, that he may learn the things that are; even so here also, not knowing clearly the unutterable mystery of the Economy, and who He may be that has come, he attempts to weave other nets, whereby he thought to know that which was hidden and obscure. And what says he? “If Thou be Son of God, command that these stones be made bread.” He said not, because you are an hungered, but, “if Thou be Son of God;” thinking to cheat Him with his compliments. Wherefore also he was silent touching the hunger, that he might not seem to be alleging it, and upbraiding Him. For not knowing the greatness of the Economy which was going on, he supposed this to be a reproach to Him. Wherefore flattering Him craftily, he makes mention of His dignity only.
What then says Christ? To put down his pride, and to signify that there was nothing shameful in what had happened, nor unbecoming His wisdom; that which the other had passed over in silence to flatter Him, He brings forward and sets it forth, saying, “Man shall not live by bread alone.”
So that He begins with the necessity of the belly. But mark, I pray you, the craft of that wicked demon, and whence he begins his wrestlings, and how he does not forget his proper art. For by what means he cast out also the first man, and encompassed him with thousands of other evils, with the same means here likewise he weaves his deceit; I mean, with incontinence of the belly. So too even now one may hear many foolish ones say their bad words by thousands because of the belly. But Christ, to show that the virtuous man is not compelled even by this tyranny to do anything that is unseemly, first hungers, then submits not to what is enjoined Him; teaching us to obey the devil in nothing. Thus, because the first man did hereby both offend God, and transgress the law, as much and more does He teach you:— though it be no transgression which he commands, not even so to obey.
And why say I, “transgression”? “Why, even though something expedient be suggested by the devils, do not thou,” says He, “even so give heed unto them.” Thus, for instance, He stopped the mouths of those devils also, proclaiming Him Son of God. And Paul too again rebuked them, crying this self-same thing; and yet what they said was profitable; but he more abundantly dishonoring them, and obstructing their plot against us, drove them away even when doctrines of salvation were preached by them, closing up their mouths, and bidding them be silent.
And therefore neither in this instance did He consent to what was said. But what says He? “Man shall not live by bread alone.” Now His meaning is like this: “God is able even by a word to nourish the hungry man;” bringing him a testimony out of the ancient Scripture, and teaching us, though we hunger, yea, whatever we suffer, never to fall away from our Lord.
But if a man say, “still He should have displayed Himself;” I would ask him, with what intent, and for what reason? For not at all that he might believe did the other so speak, but that he might, as he thought, over-argue Him into unbelief. Since the first of mankind were in this way beguiled and over-argued by him, not putting earnest faith in God. For the contrary of what God had said he promised them, and puffed them up with vain hopes, and brought them to unbelief, and so cast them out of the blessings they actually possessed. But Christ signifies Himself not to have consented, either to him then or afterwards to the Jews his partisans, in their demand of signs: invariably instructing us, whatever we may have power to do, yet to do nothing vainly and at random; nor even when want urges to obey the devil.
Source: Homilies on the Gospel of St. Matthew (New Advent)