“…[E]steem others better than himself” (verse 3), is the basic definition of true humility (Romans 12:10; Galatians 5:13; Ephesians 5:21; 1 peter 5:5). Christ is the ultimate example of selfless humility (Matthew 11:29; John 13:12-17).
Commentary from the MacArthur study Bible, notes for Philippians 2:3,5.