On his second missionary journey (which we also see a lot of info in Acts 15-18 about it), Paul entered Europe for the first time when he went to Macedonia. The first churches that he established were in Philippi and Thessalonica. Paul wrote this first letter to the Thessalonian people only a few months after the establishment of the Church. Paul is glad of their development of character and the faith, love, and endurance that can be clearly seen. They have proved themselves to be God’s People. They look forward to the climax of their salvation at the return of Jesus Christ.
Paul admits that he preached so boldly that he endured bodily harm, but he didn’t want praise nor money. Therefore, he gave to them to help them. He worked at tent making to make an income for himself. Otherwise, he did his preaching as he could. He only wanted to bring God glory.
The Thessalonians knew they had a Word from God, and that Paul is who he said he is. The Jews were trying to prevent the message of Jesus from reaching the Gentiles, but all the while, they were preparing a big divine judgment unto themselves. Paul faced many difficulties, trials, etc. through trying to preach to the Gentiles, however, he desires to revisit them soon, and talks about how well they have progressed in their faith and love. He seems overjoyed about the love they’ve cultivated.
He talks to them about marriage and work, but they don’t need to be overly dependent on each other, but rather, be ready to help others. Faults must be corrected so that they can continue as a church, and so they don’t have non-Christians criticizing them. After this starts the info about the Return of Christ. Some were worried that those who’ve died would not experience Christ’s Return, and therefore, they want people that are alive to join them, so together, they could meet Christ.
Paul said that no one knows when He will return, however, He will come unexpectedly as a thief would. He talks more about what Christ will do once He arrives, and told them to be self-controlled, strong in faith and love, and be confident in their salvation. Having unity with Christ means that they would escape wrath and enjoy Salvation to its fullest. They need to live in a way that is pleasing to God and one that encourages others.
Lastly, he sees minor difficulties have occurred, and Church leaders had the responsibility to solve such problems. Paul reminds the members to respect those who are in leadership and don’t be offended when they need to correct you. All Christians should be helpful, joyful, prayerful, and thankful. God alone can give strength to put this advice into practice, and that God wants His People to constantly progress toward greater holiness. Paul ends it by telling them to read the letter to the Church to full understanding.