Paul wrote to the Thessalonian Christians that the second coming of Christ shall be known by the commandment of the Lord. The signs of the second coming shall be noticed by the archangel calling with the sound of trumpets. Then Jesus would appear in heaven. Those who have already died in the Lord would rise first, the living ones would join them together to meet the Lord in the mid-air. For this to take place, Paul told the Thessalonian Christians to get prepared for the D- day, for it would come unexpectedly like a thief in the night. He advised that there should be no confusion in the church concerning the second coming of Jesus.
They should not panic or be deceived by false prophecies about it and they should not be caught unawares. As children of moral uprightness, Christians should not allow themselves to be taken unprepared. They should be awake, sober, watchful and bearing in mind the faith, love and hope which are means of salvation.