Christ who lives in us
Galatians 2:20 (ESV) … “I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me.”
In Galatians 2:20 Paul enlarged on the meaning of verse 19. He “died to the Law” because he was crucified with Christ; he was able “to live for God” because Christ lived in him. Basic to an understanding of this verse is the meaning of union with Christ. This doctrine is based on such passages as Romans 6:1–6 and 1 Corinthians 12:13, which explain that believers have been baptized by the Holy Spirit into Christ and into the church, the body of all true believers. Having been thus united to Christ, believers share in His death, burial, and resurrection. Paul could therefore write, I have been “crucified with Christ” (lit., “I have been and am now crucified with Christ”). This brought death to the Law. It also brought a change in regard to one’s self: and I no longer live. The self-righteous, self-centered Saul died. Further, death with Christ ended Paul’s enthronement of self; he yielded the throne of his life to Another, to Christ. But it was not in his own strength that Paul was able to live the Christian life; the living Christ Himself took up His abode in Paul’s heart: Christ lives in me. Yet Christ does not operate automatically in a believer’s life; it is a matter of living the new life by faith in the Son of God. It is then faith and not works or legal obedience that releases divine power to live a Christian life. This faith, stated Paul, builds on the sacrifice of Christ who loved us and gave Himself for us. In essence Paul affirmed, “If He loved me enough to give Himself for me, then He loves me enough to live out His life in me.”
 Campbell, D. K. (1985). Galatians. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 2, p. 596). Victor Books.