What does 1 Thessalonians 5:23 mean?

In this verse Paul refers to God as "the God of peace." God had given the Thessalonians peace when they had trusted in Jesus as their Savior. Paul insists in Romans 5:1 that justification by faith brings believers "peace with God through our Lord Jesus Christ." Further, Paul prays that God, who gives peace, would make the Thessalonians completely separated unto Himself, so that their spirit, soul, and body would be free of any valid accusation at the rapture.

Most people think of the three components of every human being as body, soul, and spirit, but Paul reverses this order, giving highest priority to the spirit and the lowest priority to the body. The spirit connects us to God and enables us to worship God and to fellowship with Him. The soul is the seat of emotions and makes us conscious of our being. The body connects us to our environment. We need to be kept faultless by God in our worship of Him and in our fellowship with Him. We need to be free of any legitimate accusation in our inner being and in our social relationships.