20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
[AD 407] John Chrysostom on Galatians 2:19-20
Ver. 19, 20. "That I might live unto God, I have been crucified with Christ."

Having said, "I am dead," lest it should be objected, how then do you live? He adds the cause of his living, and shows that when alive the Law slew him, but that when dead Christ through death restored him to life. He shows the wonder to be twofold; that by Christ both the dead was begotten into life, and that by means of death. He here means the immortal life, for this is the meaning of the words, "That I might live unto God I am crucified with Christ." How, it is asked, can a man now living and breathing have been crucified? That Christ has been crucified is manifest, but how can you have been crucified, and yet live? He explains it thus;

[AD 108] Ignatius of Antioch on Galatians 2:20
I no longer wish to live after the manner of men, and my desire shall be fulfilled if ye consent. Be ye willing, then, that ye also may have your desires fulfilled. I entreat you in this brief letter; do ye give credit to me. Jesus Christ will reveal these things to you, [so that ye shall know] that I speak truly. He is the mouth altogether free from falsehood, by which the Father has truly spoken. Pray ye for me, that I may attain [the object of my desire]. I have not written to you according to the flesh, but according to the will of God. If I shall suffer, ye have wished [well] to me; but if I am rejected, ye have hated me.

[AD 253] Origen of Alexandria on Galatians 2:20
Since Christ was in Paul, who will doubt that he was also likewise in Peter and John and in every individual among the saints, and not only in those who are on earth but also in those in heaven? For it is absurd to say that Christ was in Peter and Paul but not in the archangel Michael or Gabriel.

[AD 373] Athanasius of Alexandria on Galatians 2:20
Christ is the true Son, and so when we receive the Spirit, we are made sons. For it says; ‘you did not receive the spirit of slavery leading you back into fear, but you have received the Spirit of adopted sonship’ [Romans 8:15]. But when we are made sons in the Spirit, it is clear that we are called children of God in Christ... And when the Spirit is given to us-the Saviour said: ‘Receive the Holy Spirit’ [John 20:22]- God [The Father] is in us... But when God is in us, the Son is also in us. For the Lord Himself said: ‘I and the Father will come and make our home with him’ [John 14:23]. Next, the Son is life-for He said: ‘I am the life’ [John 14:6]- and so we are said to be given life in the Spirit... But when we are given life in the Spirit, Christ Himself is said to live in us. For it says: ‘I am crucified with Christ. It is no longer I who live, but Christ who lives in me.’ (Galatians 2:19-20). - "Letters to Separion On the Spirit, Letter 1, Chapter 19"
[AD 384] Ambrosiaster on Galatians 2:20
One who is fixed to the cross of Christ is one who, in imitation of his footsteps, is not ensnared by any worldly desire. Living to God, he appears dead to the world.

[AD 384] Ambrosiaster on Galatians 2:20
There is no doubt that Christ lives in the one who is delivered from death by faith. When Christ forgives the sins of one who is worthy of death, he himself lives in that person, since by his protection the person is snatched from death.

[AD 397] Ambrose of Milan on Galatians 2:20
This means, “Not I, who once ate from the earth [like Adam]. Not I who was once grass, as all flesh is grass, but Christ who lives in me. That is, there lives that living bread which comes from heaven, there lives wisdom, there lives righteousness, there lives the resurrection.”

[AD 407] John Chrysostom on Galatians 2:20
Ver. 20. "Yet I live; and yet no longer I, but Christ lives in me."

In these words, "I am crucified with Christ," he alludes to Baptism and in the words "nevertheless I live, yet not I," our subsequent manner of life whereby our members are mortified. By saying "Christ lives in me," he means nothing is done by me, which Christ disapproves; for as by death he signifies not what is commonly understood, but a death to sin; so by life, he signifies a delivery from sin. For a man cannot live to God, otherwise than by dying to sin; and as Christ suffered bodily death, so does Paul a death to sin. "Mortify," says he, "your members which are upon the earth; fornication, uncleanness, passion;" [Colossians 3:5], and again, "our old man was crucified," [Romans 6:6] which took place in the Bath. After which, if you remain dead to sin, you live to God, but if you let it live again, you are the ruin of your new life. This however did not Paul, but continued wholly dead; if then, he says, I live to God a life other than that in the Law, and am dead to the Law, I cannot possibly keep any part of the Law. Consider how perfect was his walk, and you will be transported with admiration of this blessed soul. He says not, "I live," but, "Christ lives in me;" who is bold enough to utter such words? Paul indeed, who had harnessed himself to Christ's yoke, and cast away all worldly things, and was paying universal obedience to His will, says not, "I live to Christ," but what is far higher, "Christ lives in me." As sin, when it has the mastery, is itself the vital principle, and leads the soul whither it will, so, when it is slain and the will of Christ obeyed, this life is no longer earthly, but Christ lives, that is, works, has mastery within us. His saying, "I am crucified with Him" "I no longer live," but "am dead," seeming incredible to many, he adds,

Ver. 20. "And that life which I now live in the flesh, I live in faith, the faith which is in the Son of God."

The foregoing, says he, relates to our spiritual life, but this life of sense too, if considered, will be found owing to my faith in Christ. For as regards the former Dispensation and Law, I had incurred the severest punishment, and had long ago perished, "for all have sinned, and come short of the glory of God." [Romans 3:23] And we, who lay under sentence, have been liberated by Christ, for all of us are dead, if not in fact, at least by sentence; and He has delivered us from the expected blow. When the Law had accused, and God condemned us, Christ came, and by giving Himself up to death, rescued us all from death. So that "the life which I now live in the flesh, I live in faith." Had not this been, nothing could have averted a destruction as general as that which took place at the flood, but His advent arrested the wrath of God, and caused us to live by faith. That such is his meaning appears from what follows. After saying, that "the life which I now live in the flesh, I live in faith," he adds,

Ver. 20. "In the Son of God, Who loved me, and gave Himself up for me."

How is this, O Paul! Why do you appropriate a general benefit, and make your own what was done for the whole world's sake? For he says not, "Who loved us," but, "Who loved me." And besides the Evangelist says, "God so loved the world;" [John 3:16] and Paul himself, "He that spared not His own Son, but delivered Him up," not for Paul only, but, "for us all;" [Romans 8:32] and again, "that He might purify unto himself a people for his own possession," [Titus 2:14] But considering the desperate condition of human nature, and the ineffably tender solicitude of Christ, in what He delivered us from, and what He freely gave us, and kindled by the yearning of affection towards Him, he thus expresses himself. Thus the Prophets often appropriate to themselves Him who is God of all, as in the words, "O God, you are my God, early will I seek You." [Psalm 63:1] Moreover, this language teaches that each individual justly owes as a great debt of gratitude to Christ, as if He had come for his sake alone, for He would not have grudged this His condescension though but for one, so that the measure of His love to each is as great as to the whole world. Truly the Sacrifice was offered for all mankind, and was sufficient to save all, but those who enjoy the blessing are the believing only. Nevertheless it did not deter Him from His so great condescension, that not all would come; but He acted after the pattern of the supper in the Gospel, which He prepared for all, [Luke 14:16] yet when the guests came not, instead of withdrawing the viands, He called in others. So too He did not despise that sheep, though one only, which had strayed from the ninety and nine. [Matthew 18:12] This too in like manner St. Paul intimates, when he says, speaking about the Jews, "For what if some were without faith, shall their want of faith make of none effect the faithfulness of God? God forbid: yea let God be found true, but every man a liar." [Romans 3:3-4] When He so loved you as to give Himself up to bring you who wast without hope to a life so great and blessed, can you, thus gifted, have recourse to things gone by? His reasoning being completed, he concludes with a vehement asseveration, saying,

[AD 407] John Chrysostom on Galatians 2:20
What are you doing, Paul, making common things your own, and claiming for yourself what was done on behalf of the whole world? For he says not “who loved us” but “who loved me.” … But Paul speaks in this highly personal voice, aware of the culpability of human nature and the ineffable compassion of Christ, aware of what he redeems us from and what grace he confers upon us. Burning with desire toward him, he utters this. In just this way did the prophets often make the universal God their own, crying, “My God, my God, I invoke you.” He shows that each of us ought to render as much thanks to Christ as though Christ had come for him alone. For God would not have withheld this gift even from one person. He has the same love for every individual as for the whole world.

[AD 420] Jerome on Galatians 2:20
Judas and the priests, with the princes, handed him over, and Pilate, to whom he was finally handed over, handed him over again. But the Father handed him over that he might save the abandoned world. Jesus gave himself, that he might do the Father’s will. But Judas and the priests and elders of the people and Pilate unwittingly handed over their lives to death.

[AD 420] Jerome on Galatians 2:20
(Verse 20.) But I no longer live; Christ lives in me. The person who once lived under the law no longer lives, for they persecuted the Church. But Christ lives in them, providing wisdom, strength, speech, peace, joy, and other virtues. The one who does not possess these virtues cannot say, 'Christ lives in me.' And all of this is said in opposition to Peter, directed at Peter.

But as for now, I live in the flesh. To be in the flesh is one thing, and to live in the flesh is another. For those who are in the flesh cannot please God (Rom. VIII, 8, 9). Therefore, it is said to those who live well: However, you are not in the flesh.

I live by faith in the Son of God, who loved me and gave himself for me. He speaks about God to the Romans, that he did not spare his own Son, but gave him up for us. Now, about Christ, that he gave himself up: 'He loved me,' he says, 'and gave himself for me.' In the Gospel, where the apostles are listed, it is stated: 'And Judas Iscariot ((also Scariot)), who betrayed him' (Luke 6:16). Again, in the same Gospel: 'Look, the one who will betray me is approaching' (Matthew 26:46). But the Scriptures mention the high priests and elders of the people, who condemned Jesus to death and, binding him, led him and delivered him to Pilate the governor (ibid., XXVII, and Mark XV). And afterwards about Pilate: He released Barabbas to them, but Jesus, after being flogged, he handed over to them to crucify (John XIX). Therefore, the Father handed over the Son, and the Son himself handed over, and Judas and the priests handed him over to the rulers, and finally, having been handed over to him, Pilate himself delivered him. But the Father handed over, in order to save the lost world: Jesus himself handed himself over, in order to do the will of the Father and his own: However, Judas and the priests and the elders of the people, and Pilate, delivered him, ignorant of life unto death. And when she also handed herself over for our salvation, blessed and very happy is he who, with Christ living in him, can say through every thought and action: I live by the faith of the Son of God, who loved me and delivered himself for me.

[AD 430] Augustine of Hippo on Galatians 2:20
The human spirit, cleaving to the Spirit of God, struggles against the flesh that is, against itself and on its own behalf. Those impulses natural to humanity, whether in the flesh or in the soul, which remain because of our acquired debility, are restrained by discipline for the sake of obtaining salvation. So the human being who does not live according to human nature can already say, “I live, yet not I, but Christ lives in me.” For where I am not I, I am more happily I. Thus when any reprobate impulse arises according to my old human nature, to which I who serve the law of God with my mind do not consent, I may now say this: “now I am not the one doing that.”

[AD 749] John Damascene on Galatians 2:20
To the Law he says or inasmuch as it pertains to the Law.