is a letter to the church from Paul, Silvanus and Timothy. Paul and his companions begin the first chapter by giving thanks for these brothers for their submissiveness toward Christ in their "work of faith, labor of love and steadfastness of hope" and telling them that he remembers them in prayers. These brothers, Paul says were "loved by God and chosen by God" and that was made evident by their full conviction after hearing the gospel and responding to the power of the Holy Spirit. These men also saw the example of Paul who lived his life for the Lord like an open book.
The gospel they heard was that Christ Jesus died for their sins. The gospel is the good news that God offered up Jesus, His own Son, so sinners might be saved from His wrath. The Thessalonians knew they were sinners chasing idols. Therefore, they turned from sin, turned to God in faith, and received forgiveness and deliverance. Following Christ would bring persecution yet the Thessalonians responded with joy. Paul noted that their changed lives were leaving a mark on others so that more were receiving the good news. Evident to all was the fact that these men, after receiving the gospel, turned from the things that were enslaving them and immediately began serving God.
-From 1 Thessalonians 1:1-10