After Paul draws things together by sharing about Tychicus, his faithfulness, and his purpose for being sent, he now draws things to a close in verses 23-24. Paul has a unique way in closing his letters in such a way that ties in the doctrine that he has been teaching in his epistle with encouraging closing remarks.
“Peace be to the brothers,” who are “the brothers”? they are of we who believe in Christ, who have been born from above into the family of God, thus being adopted as sons and obtaining an inheritance. Therefore we can refer to each other as brothers. Peace…what is the peace based upon? Romans 5:1 says: “Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus Christ.” We can only have peace with the brethren if we have peace with God. We can only have peace with God if we have been justified by Christ.
“and love with faith, from God the Father and the Lord Jesus Christ.” This shows that the source of love and of faith are God the Father, and Christ the son. This also highlights the familial relationship hinted at in these verses and expounded upon throughout the rest of the letter. God the Father sent Christ the son to take our sin upon him so that we who place our faith in him have Christ’s righteousness imputed to our account, declaring us righteous before God and thus securing peace with him. This is why we can call each other “brothers”
“Grace be with all who love our Lord Jesus Christ with love incorruptible.” God’s unmerited favor is to be to all who love Christ, who is our Lord, with incorruptible love. But that’s impossible for us, to love Christ perfectly. This is where grace comes in. God helps us to do what we can’t do on our own. It is only by God’s grace that we can have peace with him. It is only by God’s grace that we have faith to believe in him. Paul begins his epistle magnifying God’s grace (Eph 1:2) and ends his epistle magnifying God’s grace (Eph 6:24). This is a great reminder that as trophies of God’s grace (Eph 2:5-7), all that he has done in our lives and will do, is to the praise of his glorious grace.