Paul draws attention to the Thessalonians’ knowledge of two things: (a) how he lived among them; and (b) that he acted for their sake. In this way he prepares for 1 Thessalonians 2:1–12, which deals with both of these issues in much greater detail,1,2 and for 1 Thessalonians 1:6–10, where the Thessalonians’ conversion is spoken of as an imitation of Paul and his coworkers. Furthermore, he evokes the warm relationship between himself and the Thessalonians, and in so doing provides a strong foundation for the letter’s encouragement and exhortation.
5 because our gospel came to you not only in word, but also in power and in the Holy Spirit and with full conviction. You know what kind of men we proved to be among you for your sake.