The book of 2 Thessalonians is a Pauline Epistle (letter from Paul). The Apostle Paul wrote it about 52-54 A.D., several months after his first letter to the church in Thessalonica. The key personalities in this book are the Apostle Paul, Silas, and Timothy. Paul wrote this letter to reemphasize the coming return of Jesus Christ. Some of the people in Thessalonica had thought that Jesus had already returned, this letter was written to correct any misunderstandings.