Verses 1-12
1:1-2:12 CONCERNING CHRIST'S RETURN
A source of encouragement (1:1-12)
The Thessalonian Christians continue to grow in faith, love and endurance, in spite of the constant persecution they suffer; and Paul continues to talk about them as an example that should challenge others (1:1-4; cf. 1 Thessalonians 1:3; 1 Thessalonians 1:6-7). He encourages them to keep moving forward, and points out that their suffering is proof of the genuineness of their faith. Their endurance shows that they are worthy to inherit the kingdom of God. In his righteous judgment God uses sufferings to bring his people to maturity, but by the same righteous judgment he will punish those who persecute them (5-6).
Christ's return will bring relief and rest to the persecuted believers (Paul here links himself with the Thessalonians), but it will also bring judgment to the ungodly. For the one it will bring glory, for the other eternal destruction (7-10). Paul prays that by God's power the Thessalonians will go on producing those qualities of Christian character that are fitting in those whom God has called. Such character will bring honour to Christ now and will reach its full expression in the age to come (11-12).