As yet the church had no definite knowledge as to the time when the Master would return. When the apostle in his first letter to the Thessalonians, said, “We which are alive and remain shall be caught up,” the brethren understood him to mean that Christ was coming while some of them were still alive. In his second epistle he corrects their wrong conception of his letter, and tells them that “that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition; who opposeth and exalteth himself above all that is called God, or that is worshiped.” 542 Thessalonians 2:3, 4. GSAM 72.2