1-е Петра 4:13

inasmuch as--The oldest manuscripts read, "in proportion as"; "in as far as" ye by suffering are partakers of Christ's sufferings, that is, by faith enter into realizing fellowship with them; willingly for His sake suffering as He suffered. with exceeding joy--Greek, "exulting joy"; now ye rejoice amidst sufferings; then ye shall EXULT, for ever free from sufferings (Pe1 1:6, Pe1 1:8). If we will not bear suffering for Christ now, we must bear eternal sufferings hereafter.

The work of a Christian is twofold - doing the will of God and suffering his pleasure. This chapter directs us in both. The duties we are here exhorted to employ ourselves in are the mortification of sin, living to God, sobriety, prayer, charity, hospitality, and the best improvement of our talents, which the apostle presses upon Christians from the consideration of the time they have lost in their sins, and the approaching end of all things (Pe1 4:1-11). The directions for sufferings are that we should not be surprised at them, but rejoice in them, only take care not to suffer as evil-doers. He intimates that their trials were near at hand, that their souls were in danger as well as their bodies, and that the best way to preserve their souls is to commit them to God in well-doing.

4:13 Christians are called to suffer with Christ in order to be glorified with him (see also Rom 8:17).