"For the Lord Himself will descend from heaven with a shout, with the voice of the archangel, and with the trumpet of God; and the dead in Christ shall rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air, and thus we shall always be with the Lord," (I Thessalonians 4:16,17).
* This return of the Lord Jesus Christ for His own is called 'the blessed hope' in Titus 2:13, and is to serve as a great comfort when we are separated from a believer by death. Therefore, we need not grieve as the hopeless non-Christian, since we will see loved ones again who died in the Lord. What a marvelous certainty is this hope --- that, as surely as the Lord Jesus came the first time, so He will come again!
* In describing this the next great event in history, the apostle Paul's desire was to convey comfort to grieving family and relatives of deceased believers. In stark contrast to the hopeless unsaved person, the mourning of the Christian should be interwoven with the hope of the Lord's imminent return.
And even more exciting than being reunited with saved loved ones, we will see our blessed Savior in all His glory!