Paul's exhortation it to rejoice
in the Lord.
The Christian is not happy about her suffering or the inconvenience of her circumstances. She does not rejoice in that. But he can rejoice in that he has the Lord as the
"bountiful supply of the Spirit of Jesus Christ"
What can a man take from this age into the next coming age?
His material wealth will not accompany him.
His worldly fame will be of no avail to him in the coming age.
The only worthwhile thing he can carry out of this world into the coming world is the Christ that he gains in his soul. And this gaining of Christ is accomplished with the "help" of turning to depend upon Christ in adverse situations of suffering.
Paul rejoiced in Christ. He did not rejoice because of all of his sufferings. He rejoiced in the fact that through these sufferings he was gaining Christ.
" ... I also count all things to be loss on account of the excellency of the knowledge of Christ Jesus my Lord, on account of whom I have suffered the loss of all things and count them as refuse that I may GAIN CHRIST." (Phil. 3:8)
Everything in comparison to gaining Christ in his soul, was to Paul refuse. That is of inferior quality. Actually, i think it means dog food. That is in comparison to Christ, all other things were junky.
His fame - "dog food" in comparison to Jesus Christ.
His material wealth if any, in comparison to Christ was refuse.
Even his comfort, in comparison to having more and more of Christ wrought into his being, was of inferior quality.
So he rejoiced in Christ. And he exhorts the Christians in Philippi to
"rejoice in the Lord".
Christ is being wrought into his being. Christ is being more worked into his personality. He will take out of this age and into the next kingdom age the Christ that has been wrought into his being, albeit sometimes through suffering and through the "loss" of things which the world counts as valuable.
As a result of Paul magnifying Jesus Christ while in prison, it appears some of Ceasar's household became Christians
(4:22).
"Now I want you to know, brothers, that the things concerning me have turned out rather to the advancement of the gospel,
So that my bonds have become manifest as being in Christ among the whole Praetorian guard and to all the rest." (1:12,13)