W. Kelly shows, through the Word, the essential difference between the coming of the Lord and the day of the Lord. In the first (John 14; 1 Thess. 4; 1 Cor. 15), He will come from heaven on the clouds to meet His resurrected or transmuted people (heavenly saints), and bring them to the Father's house. In the second, he will come from heaven to earth, with the heavenly saints, to exercise judgments and introduce his millennial reign. The first has to do with grace, by virtue of redemption; the second (which is spoken of extensively in the Old Testament) relates to service, responsibility, and rewards.
The author places great emphasis on 2 Thess. 2, which clearly distinguishes between the two. Alas, Christianity very early on confused the two. The reason rests on the one hand on the alliance of the church with the world, on the other hand on a bad interpretation and a bad translation of this passage. As a result of Satan's efforts, Christians, from the beginning of the Christian era, were thus deprived of one of the greatest blessings after redemption: heavenly hope. The period following the Awakening provided an opportunity to bring this and other truths that were essential to grace period believers back into focus.