5:19 Speaking to yourselves. Ephesians 5:19-21 illustrates what the Spirit-filled life will be. Ephesians 5:19 applies not so much to congregational singing, as to “melody in your heart.” Such a life will be fruitful (Ephesians 5:9), active (Ephesians 5:16), understanding (Ephesians 5:17), joyful (Ephesians 5:19), thankful (Ephesians 5:20), and submissive (Ephesians 5:21). It will also be bold in witnessing (Acts 4:31).
5:20 Giving thanks always. This all-inclusive command to thankfulness for everything is found frequently in the New Testament (e.g., Philippians 4:6, I Thessalonians 5:18). To obey this command would be clearly impossible apart from a strong belief in Jesus Christ as both omnipotent Creator and living Savior. But with this assurance, “we know that all things work together for good to them that love God, to them who are the called according to His purpose” (Romans 8:28), and therefore can be thankful for “all things.”