First Reading — Jeremiah 20:7-9
Athanasius of Alexandria
On 20:9
For so shall we remain partakers of Christ if we hold fast to the end the Spirit given at the beginning. For he said, "do not quench," not because the Spirit is placed in the power of people and is able to suffer anything from them, but because bad and unthankful people manifestly wish to quench it, since they, like the impure, persecute the Spirit with unholy deeds.… Now they, being without understanding, and deceitful and lovers of sin, walk still as in darkness, not having that "light that lights every one who comes in the world." Now a fire such as this laid hold of Jeremiah the prophet, when the word was in him as a fire and he said, "I leave every place and am not able to endure it." And our Lord Jesus Christ, being good and a lover of humankind, came that he might cast this on earth, and he said, "And would that it were already kindled!"
Responsorial Psalm — Psalm 63:2, 3-4, 5-6, 8-9
John Chrysostom
On 62:7
Why do we forget about wickedness? It is due to our remembrance of good things, due to our remembrance of God. If we continually remember God, we cannot remember those things also. For [he says], "When I remembered you on my bed, I thought on you in the morning dawn." We ought then to have God always in remembrance, but then especially, when thought is undisturbed, when by means of that remembrance [one] is able to condemn himself, when he can retain [things] in memory. For in the daytime indeed, if we do remember, other cares and troubles entering in, drive the thought out again; but in the night it is possible to remember continually, when the soul is calm and at rest; when it is in the heaven, and under a serene sky. "The things that you say in your hearts you should grieve over on your beds," he says. For it was indeed right to remember this throughout the day also. But inasmuch as you are always full of cares and distracted amid the things of this life, at least then remember God on your bed; at the morning dawn meditate on him.
Second Reading — Romans 12:1-2
Irenaeus
On 12:1
Those who have become acquainted with the secondary (i.e., under Christ) constitutions of the apostles, are aware that the Lord instituted a new oblation in the new covenant, according to [the declaration of] Malachi the prophet. For, "from the rising of the sun even to the setting my name has been glorified among the Gentiles, and in every place incense is offered to my name, and a pure sacrifice;" as John also declares in the Apocalypse: "The incense is the prayers of the saints." Then again, Paul exhorts us "to present our bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service." And again, "Let us offer the sacrifice of praise, that is, the fruit of the lips." Now those oblations are not according to the law, the handwriting of which the Lord took away from the midst by cancelling it; but they are according to the Spirit, for we must worship God "in spirit and in truth." And therefore the oblation of the Eucharist is not a carnal one, but a spiritual; and in this respect it is pure. For we make an oblation to God of the bread and the cup of blessing, giving Him thanks in that He has commanded the earth to bring forth these fruits for our nourishment. And then, when we have perfected the oblation, we invoke the Holy Spirit, that He may exhibit this sacrifice, both the bread the body of Christ, and the cup the blood of Christ, in order that the receivers of these antitypes may obtain remission of sins and life eternal. Those persons, then, who perform these oblations in remembrance of the Lord, do not fall in with Jewish views, but, performing the service after a spiritual manner, they shall be called sons of wisdom.
Gospel — Matthew 16:21-27
Origen
On 16:21
And observe that it is not said,’ He began to say,’ or ‘to teach,’ but to shew; for as things are said to be shewn to the sense, so the things which Christ spake are said to be shewn by Him. Nor indeed do I think, that to those who saw Him suffering many things in the flesh, were those things which they saw so shewn as this representation in words shewed to the disciples the mystery of the passion and resurrection of Christ. At that time, indeed, He only began to shew them, and afterwards when they were more able to receive it, He shewed them more fully; for all that Jesus began to do, that He accomplished. He must needs go to Jerusalem, to be put to death indeed in the Jerusalem which is below, but to rise again and reign in the heavenly Jerusalem. But when Christ rose again, and others were risen with Him, they no longer sought the Jerusalem which is beneath, or the house of prayer in it, but that which is above. He suffers many things from the elders of the earthly Jerusalem, that He may be glorified by those heavenly elders who receive His mercies. He rose again from the dead on the third day, that He may deliver from the evil one, and purchase for such as are so delivered this gift, that they be baptized in spirit, soul, and body, in the name of the Father, and the Son, and the Holy Spirit, who are three days perpetually present to those that through them have been made children of light.
On 16:22
While Christ was yet speaking the beginnings of the things which He was shewing unto them, Peter considered them unworthy of the Son of the living God. And forgetting that the Son of the living God does nothing, and acts in no way worthy of blame, he began to rebuke Him; and this is what is said, And Peter took him, and began to rebuke him.
On 16:23
As though Christ Himself had needed a propitiation. His affection Christ allows, but charges him with ignorance; as it follows, He turned and said unto Peter, Get thee behind me, Satan, thou art an offence unto me.
On 16:23
Yet the words in which Peter and those in which Satan are rebuked, are not, as is commonly thought, the same; to Peter it is said, Get thee behind me, Satan; that is, follow me, thou that art contrary to my will; to the Devil it is said, Go thy way, Satan, understanding not ‘behind me,’ but ‘into everlasting fire.’ He said therefore to Peter, Get thee behind me, as to one who through ignorance was ceasing to walk after Christ. And He called him Satan, as one, who through ignorance had somewhat contrary to God. But he is blessed to whom Christ turns, even though He turn in order to rebuke him. But why said He to Peter, Thou art an offence unto me, (Ps. 119:165.) when in the Psalm it is said, Great peace have they that love thy law, and there is no offence to them? It must be answered, that not only is Jesus not offended, but neither is any man who is perfect in the love of God; and yet he who does or speaks any thing of the nature of an offence, may be an offence even to one who is incapable of being offended. Or he may hold every disciple that sinneth as an offence, as Paul speaks, Who is offended, and I burn not?. (2 Cor. 11:29.)
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.