V.1 We are to live in such a way that it will be pleasing to God. Remember, He has given us the power to do this.
V.2-8 Here we have a warning against immorality, gently spoken, surely. The Thessalonians had lived the immoral, pagan life before being saved. It was hard for them to change suddenly. But the power of the new life is stronger than the power of the old life. When living in obedience to God’s will (verse 3), this power is able to overcome the power of the old life. The Lord would punish any who disregarded the purity of marriage. A man who took another man’s wife, not only disregarded the husband but also disregarded the body as the dwelling place of God’s Spirit (1 Cor. 6:18-20).
V.8-12 He didn’t need to remind them to love one another, but says that they should love each other even more.
V.11 One of the few times the word “study” is used in the Scriptures. Notice what we are to study to be! The heart that rests in Christ and His present position in glory, is quiet, at peace, and is satisfied with the circumstances of his life.
V.12 Beautiful promise to the person who lives Christ before his unsaved neighbors and acquaintances, not depending on them for his needs.
V.13-18 Important six verses. Unless you understand them you will not have the hope which every believer needs to have daily. No events in the world need to take place before this event. The Lord Jesus can come at any moment, and take away every believer to heaven. Every true believer will hear His voice — not only those who are watching, as is being taught by some Christians today. All others will be left behind for judgment. There is no second chance for those who have heard the gospel.