What does Philippians 4:20 mean?

Paul concludes the main text of his letter with a brief doxology, or a formulated expression of praise. God is both Lord and Father to Christians. Jesus had taught them to pray to God as their Father in heaven (Matthew 6:9). Glory is a theme throughout the letter, appearing seven times in total (Philippians 1:11, 26; 2:11; 3:3, 19; 4:19, 20).

This verse also closely parallels Philippians 2:11, which looked forward to the day when, "every tongue [will] confess that Jesus Christ is Lord, to the glory of God the Father." Interestingly, a similar ending is found in the book of Hebrews, which also references Christ's glory (Hebrews 13:21). Though we are not absolutely sure that the book of Hebrews was written by Paul, it certainly reflects elements of his style, particularly in this conclusion. Paul also uses similar phrases in Galatians 1:5, 1 Timothy 1:17, and 2 Timothy 4:18.