The Apostle Paul continues his letter to the church at Thessalonica by authenticating himself as an apostle of Christ because certain Jews were spreading terrible lies and rumors about him and his ministry.  He was reminding these believers how he had endured terrible persecution in Philippi before he was able to minister the Gospel of Christ to them in Thessalonica.  He reminded them he was like loving father to his children, and as such, he was willing to endure the hardships to be able to minister the Gospel to them.