World Wide Study Bible
a Bible passage
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 (1Pe 1:6, 8). If we will not bear suffering for Christ now, we must bear eternal sufferings hereafter.