The passage discusses the return of Christ and the gathering of believers to meet Him. It states that: 1) Believers who have died will be resurrected first, with their bodies changed into glorious forms. 2) Living believers will be "caught up" miraculously to meet the Lord in the air. 3) Both those resurrected and those still living will be reunited together in the clouds to forever be with the Lord. The purpose is to comfort Christians by assuring them of their blessed hope to ultimately be with Christ.