3 For the purpose of God for you is this: that you may be holy, and may keep yourselves from the desires of the flesh; 4 So that every one of you may keep his body holy and in honour; 5 Not in the passion of evil desires, like the Gentiles, who have no knowledge of God; 6 And that no man may make attempts to get the better of his brother in business: for the Lord is the judge in all these things, as we said to you before and gave witness. 7 Because it is God's purpose that our way of life may be not unclean but holy.
Matthew Henry's Commentary on 1 Thessalonians 4:3-7
Commentary on 1 Thessalonians 4:1-8
(Read 1 Thessalonians 4:1-8)
To abide in the faith of the gospel is not enough, we must abound in the work of faith. The rule according to which all ought to walk and act, is the commandments given by the Lord Jesus Christ. Sanctification, in the renewal of their souls under the influences of the Holy Spirit, and attention to appointed duties, constituted the will of God respecting them. In aspiring after this renewal of the soul unto holiness, strict restraint must be put upon the appetites and senses of the body, and on the thoughts and inclinations of the will, which lead to wrong uses of them. The Lord calls none into his family to live unholy lives, but that they may be taught and enabled to walk before him in holiness. Some make light of the precepts of holiness, because they hear them from men; but they are God's commands, and to break them is to despise God.