The apostle Paul dedicated his life to preaching the gospel of the Kingdom of God (Acts 14:22 Acts 14:22Confirming the souls of the disciples, and exhorting them to continue in the faith, and that we must through much tribulation enter into the kingdom of God.
American King James Version×; Acts 19:8 Acts 19:8And he went into the synagogue, and spoke boldly for the space of three months, disputing and persuading the things concerning the kingdom of God.
American King James Version×; Acts 20:25 Acts 20:25And now, behold, I know that you all, among whom I have gone preaching the kingdom of God, shall see my face no more.
American King James Version×; Acts 28:23-31 Acts 28:23-31  And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.  And some believed the things which were spoken, and some believed not.  And when they agreed not among themselves, they departed, after that Paul had spoken one word, Well spoke the Holy Ghost by Esaias the prophet to our fathers,  Saying, Go to this people, and say, Hearing you shall hear, and shall not understand; and seeing you shall see, and not perceive:  For the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should be converted, and I should heal them.  Be it known therefore to you, that the salvation of God is sent to the Gentiles, and that they will hear it.  And when he had said these words, the Jews departed, and had great reasoning among themselves.  And Paul dwelled two whole years in his own hired house, and received all that came in to him,  Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him.
American King James Version×). In the process he was subjected to persecution, beatings and several periods of imprisonment. When he wrote his letter to the Philippians, he was enduring a period of house arrest in Rome. Paul knew that the Roman government had authority to put prisoners to death. He knew what the future might hold for him, whether it be execution on the one hand or his release on the other.
In Philippians 1:23-24 Philippians 1:23-24  For I am in a strait between two, having a desire to depart, and to be with Christ; which is far better:
 Nevertheless to abide in the flesh is more needful for you.
American King James Version×he writes of the two possible outcomes: "For I am hard-pressed between the two, having a desire to depart and be with Christ, which is far better. Nevertheless to remain in the flesh is more needful for you."
Many have assumed from Paul's words here that he believed that at the moment of his death his consciousness would leave his body to join Christ in heaven. But is this the case?
Before focusing on what this scripture says, let's notice what it does not say. It does not say when or where Paul would be with Christ if he departed. Neither is the terminology of departure intended to be geographic—as in leaving the earth to go to heaven. There is no reference to heaven in these verses. To conclude otherwise is to read assumptions into Paul's words. Paul is simply referring to departing from his present, physical life—leaving it behind through death.
When writing to the Philippians here, Paul was struggling with two desires. He wanted to be done with his fleshly life and be with Christ, but he also wanted to remain with God's people.
In his second letter to Timothy he speaks dogmatically of what lies ahead, knowing the end of his physical life is near and he is ready to depart: "For I am already being poured out as a drink offering, and the time of my departure is at hand. I have fought the good fight, I have finished the race, I have kept the faith. Finally, there is laid up for me the crown of righteousness, which the Lord, the righteous Judge, will give to me on that Day, and not to me only but also to all who have loved His appearing" (2 Timothy 4:6-8 2 Timothy 4:6-8  For I am now ready to be offered, and the time of my departure is at hand.
 I have fought a good fight, I have finished my course, I have kept the faith:
 From now on there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at that day: and not to me only, but to all them also that love his appearing.
American King James Version×).
Paul, then, understood that he was not to receive his reward immediately at death. He knew that if executed, he would go to the grave, and there his remains would lie until the time of his resurrection. He understood that, since the dead have no thought processes whatsoever, in his next waking moment he would be with the returning Messiah, Jesus, joining Him along with the other saints at the time of the resurrection.
As he wrote to Timothy, he knew there was laid up for him a crown of righteousness that he would be given "on that Day" of Christ's appearing—at Jesus' second coming. As Paul noted, Jesus will bring Paul's reward with Him. Paul will receive it at that time, not before, along with all others who will be resurrected at Christ's return.
Describing this resurrection, Paul explains to the church in Corinth: "Behold I tell you a mystery: We shall not all sleep, but we shall all be changed—in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed" (1 Corinthians 15:51-52 1 Corinthians 15:51-52  Behold, I show you a mystery; We shall not all sleep, but we shall all be changed,
 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
American King James Version×). Paul knew he would receive his reward—his "change"—at Christ's coming. He also knew that death before that time would mean "sleep," unconsciousness, until the resurrection.
The time from Paul's death until his resurrection at the same time as all of Christ's followers will seem to him but a mere moment. He will be with Christ as a glorified son of God in the next moment of his consciousness. No wonder Paul, weary of his sufferings in this life, desired to depart from it and to be with Christ!