1. God's work at work in you (13-16)
The gospel does not originate in man but in God. The apostles taught God's word, not their own ideas. Their teaching came with divine power and the Holy Spirit. The Thessalonians received the message as God's word. God's word changed them and continued to work in them. The evidence was in their suffering. They were severely persecuted for their faith, like the believers in Judea and like the apostles themselves. Believing God's word as it is will bring trouble from unbelievers. But unbelievers face something even worse - God's wrath. How we view the gospel shapes our life and lifestyle.
2. You are our glory and joy (17-20)
Paul really wanted to visit the Thessalonians after being forced out. This would put him at risk but he loved the Thessalonians. However, Satan blocked the way. The apostles' glory and joy was in the Thessalonians' transformed lives.