First Reading — Deuteronomy 4:32-40
John Chrysostom
On 4:33
"You have never seen his face." Yet Isaiah, Jeremiah, Ezekiel and many others say that they have seen him. What is it, therefore, that Christ meant here? He was introducing them to a philosophical teaching, showing gradually that with regard to God there is neither voice nor outward appearance; he is superior to such forms and sounds. Just as by saying, "You have never heard his voice," he did not mean that God utters sound but is not heard, so by saying, "You have never seen his face," he did not mean that God has outward form but cannot be seen. Neither sound nor form exists with regard to God. Indeed, in order that they might not say, "You are making a display of knowledge in vain, since God spoke only to Moses" (they actually did say, "We know that God spoke to Moses; but as for this man, we do not know where he is from"), he spoke in this way to show that with regard to God there is neither voice nor outward appearance.
Responsorial Psalm — Psalm 77:12-13, 14-15, 16 and 21
Ambrose of Milan
On 76:17
This is not the only example of the obedience of water available to us, for elsewhere we find it written, "The waters saw you, O God; the waters saw you, and they were afraid." What is said here of the waters does not seem to be without a semblance of truth, since elsewhere the prophet also speaks in the same manner: "The sea saw and fled; Jordan was turned back." Who does not know how in actual fact the sea fled at the crossing of the Hebrews? When the waters were divided, the people crossed over, believing because of the dust under their feet that the sea had fled and that the waters had vanished. Therefore, the Egyptian believed what he saw and entered in, but the waters that had fled returned for him. The waters, then, know how to gather, how to fear and how to flee, when commanded to do so by God. Let us imitate these waters, and let us recognize one congregation of the Lord, one church.
Gospel — Matthew 16:24-28
Origen
On 16:24
But though a man may seem to keep from sin, yet if he does not believe in the cross of Christ, he cannot be said to be crucified with Christ; whence it follows, And take up his cross.
On 16:24
This may be understood in two ways. First thus; if any lover of this present life spares his life, fearing to die, and supposing that his life is ended with this death; he seeking in this way to save his life, shall lose it, estranging it from life eternal. But if any, despising the present life, shall contend for the truth unto death, he shall lose his life as far as this present life is concerned, but forasmuch as he loses it for Christ, he shall the more save it for life eternal. Otherwise thus; if any understand what is true salvation, and desire to obtain it for the salvation of his own life, he by denying himself loses his life as to the enjoyments of the flesh, but saves it by works of piety. He shews by saying. For he that will, that this passage must be connected in sense with that which went before. If then we understand the first, Let him deny himself, of the death of the body, we must take this that follows of death only; but if we understand the first of mortifying the propensities of the flesh, then, to lose his life, signifies to give up carnal pleasures.
On 16:26
I suppose also that he gains the world who does not deny himself, nor loses Ms own life as to carnal pleasures, and thence suffers the loss of his soul. These two things being set before us, we must rather choose to lose the world, and gain our souls.
On 16:26
And at first sight indeed the ransom of the soul might be supposed to be in his substance, that a man should give his substance to the poor, and so should save his soul. But I suppose that a man has nothing that giving as a ransom for his soul he should deliver it from death. God gave the ransom for the souls of men, namely the precious blood of His Son.
On 16:26
Morally; To those who are nearly brought to the faith, the Word of God wears the form of a servant; but to those that are perfect, He comes in the glory of the Father. His angels are the words of the Prophets, which it is not possible to comprehend spiritually, until the word of Christ has been first spiritually comprehended, and then will their words be seen in like majesty with His. Then will He give of His own glory to every man according to his deeds; for the better each man is in his deeds, so much the more spiritually does he understand Christ and His Prophets. They that stand where Jesus stands, are they that have the foundations of their souls rested upon Jesus; of whom such as stood firmest are said not to taste death till they see the Word of God; which comes in His kingdom when they see that excellence of God which they cannot see while they are involved in divers sins, which is to taste death, forasmuch as the soul that sinneth, dies. For as life, and the living bread, is He that came down from heaven, so His enemy death is the bread of death. And of these breads there are some that eat but a little, just tasting them, while some eat more abundantly. They that sin neither often, nor greatly, these only taste death; they that have partaken more perfectly of spiritual virtue do not taste it only, but feed ever on the living bread. That He says, Until they see, does not fix any time at which shall be done what had not been done before, but mentions just what is necessary; for he that once sees Him in His glory, shall after that by no means taste death.
On 16:27
As much as to say; The Son of Man is now come, but not in glory; for He ought not to have been ordained in His glory to bear our sins; but then He shall come in His glory, when He shall first have made ready His disciples, being made as they are, that He might make them as He is Himself, in the likeness of His glory.