What does Philippians 4:23 mean?

Paul concludes with a statement similar to some of his other letters: "The grace of the Lord Jesus Christ be with your spirit." The closest parallel is found in Philemon 1:25. That verse uses the same exact phrase, as the conclusion to another of the Prison Epistles. In 2 Corinthians 13:14, Paul also uses the phrase "The grace of the Lord Jesus Christ." Romans 16:20 ends with, "The grace of our Lord Jesus Christ be with you." Other Pauline letters use very similar words in end remarks (Galatians 6:18; 1 Thessalonians 5:28; 2 Thessalonians 3:18).

Why this emphasis on grace to end his letters? Perhaps Paul, a man trained to follow the law in the strictest way, had been so transformed by the grace of Jesus that he could not help but emphasize it repeatedly. We are saved by grace and live by God's grace each step of each day. Paul's repeated emphasis on God's work in our lives, rather than our own human accomplishments, serves as a reminder of the true source of our changed lives and spiritual strength.