1st and 2nd Thessalonians focus on Christ's second coming. Paul wrote these letters to the church in Thessalonica to encourage believers and instruct them to live holy lives as they awaited Christ's return. He reminds them that Christ's second appearance will be sudden, just as the first was to philosophers. Throughout the letters, Paul praises the church for their faith and instructs them on holy living, correcting any misunderstandings about Christ's second coming.