Rev 5:4, 2 Cor 1:8-9, 1 Cor 4:9
Paul has been ministering and living all his life for the resurrection in Christ. (1 Cor 15:19-20, 2 Cor 1:8-9, 1 Cor 4:9)
1 Cor 15:19 If in this life only we have hope in Christ, we are of all men most miserable. 20 But now is Christ risen from the dead, and become the firstfruits of them that slept.
2 Cor 1:8 For we would not, brethren, have you ignorant of our trouble which came to us in Asia, that we were pressed out of measure, above strength, insomuch that we despaired even of life: 9 But we had the sentence of death in ourselves, that we should not trust in ourselves, but in God which raiseth the dead:
1 Cor 4:9 For I think that God hath set forth us the apostles last, as it were appointed to death: for we are made a spectacle unto the world, and to angels, and to men.
John also looked to salvation in Christ and lived his life. So he wept a lot because he couldn't find anyone to open the book of life. (Rev 5:4)
Rev 5:4 And I wept much, because no man was found worthy to open and to read the book, neither to look thereon.