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The Lord Jesus Christ, the Head of the Body, was giving Paul fresh revelation of His further purposes - the Body of Christ. This revelation was not known in previous times.

this is one of the mysteries that God revealed to Paul.

Ephesians 5:³² This is a great mystery: but I speak concerning Christ and the church.

Gen 2:¹⁸ And the Lord God said, It is not good that the man should be alone; I will make him an help meet for him.

the woman was to be the help mate for the man and the man was the head of the marriage relationship (not at all popular in today's world).

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In this Paul`s first letter we read of how he was like a father and mother to the Thessalonians. (1 Thess. 2: 7 & 11) We read of the wonderful truth of the `catching away` of the saints to be with the Lord, a revelation not known previously.

This wonderful truth encouraged Paul`s disciples, the Thessalonians, who were concerned about those believers who had died. Paul goes on to explain -

`But I do not want you to be ignorant, brethren, concerning those who have fallen asleep, lest you should sorrow as others who have no hope. For if we believe that Jesus died and rose again, even so God will bring with Him those who sleep in Jesus.....

And 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 be always with the Lord.` (1 Thess. 4: 13 - 17)

this is another one of the mysteries as revealed by God to Paul. and to think long ago churches used to talk about these mysteries. but not now. but this is prophesied its called Apostacy, a falling away from the truth into false doctrines and fables

2 Tim 4:For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears; ⁴And they shall turn away their ears from the truth, and shall be turned unto fables.

today we have the 'God' channel and very questionable characters spouting nothing more than popular psychology with barely enough scripture to call it Christian and some of that teaching is in error.

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`The great day of the LORD is near; .....that day is a day of wrath, a day of trouble and distress, a day of devastation and desolation, a day of darkness and gloominess, a day of clouds and thick darkness, a day of trumpet and alarm against the fortified cities and against the high towers.` (Zeph. 1: 14 - 16)

now there is another term used which people get confused by The Day of Christ, which if i have understood correctly means the Rapture event, when Christ will appear on the clouds

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Paul told the Thessalonians that that Day would not overtake them as they were sons of light and not darkness.  (1 Thess. 5: 1 - 5)

`But you, brethren, are not in darkness, so that this day should overtake you as a thief.` (1 Thess. 5: 4)

Paul was telling them this because they were Saved into the body of Christ and thereby a believer in Christ. did you know that just by going to church on a Sunday doesnt make you a Christian, just like when i go to the garage doesnt make me a car! what makes you a Christian is believing WHAT  Jesus Christ did for you. We are all sinners and we all need a Saviour. The world will not save us in fact it is the world that is driving us towards hell.

to get saved 1 Corinthians 15:1-4 , Ephesians 1:13

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Then in Paul`s second letter to the Thessalonians he explains in detail what will happen in the Day of the Lord. (Note `Day,` is a time period AND a specific day.)

`...the Lord Jesus is revealed from heaven with His mighty angels, in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ.` (2 Thess. 1: 7 & 8)

this will be at Armageddon, when the Lord will stand on the Mount of Olives. unlike the Day of Christ where the Lord only appears, in the clouds, but doesnt actually return to earth.