This phrase is found in only one other of Paul’s introductory thanksgivings (Romans 1:8). This suggests that it has been added here for some definite reason. Perhaps Paul wanted to give the letter a warmer tone by emphasizing his thankfulness for each one of the believers, or maybe he wanted to assure all the believers—even those who would need to be exhorted or gently rebuked later in the letter (e.g., 1 Thessalonians 5:14–15)—that he was thankful for each and every one, and was confident that God was at work in each one of them.^1,2