Continuing towards the end of the letter Paul outlines three characteristics for Christians, rejoicing, praying and giving thanks.
References
1 Thessalonians 5 16-18
2 Corinthians 5:17
Galatians 5:22-23
Romans 4:17
Acts 16:25
Romans 5:3
Colossians 1:24
Philippians 4:4
Luke 18:1
Romans 12:12
Ephesians 6:16-18