But because you are partakers of Christ's sufferings, rejoice; that at the revelation of his glory also you may rejoice with exceeding joy.
But rejoice that you participate -- (koinōneite, from koinōneō, “to share”; related nouns are koinōnia, “communion, fellowship, close relationship,” and koinōnos, “sharer”; cf. 1 Peter 5:1). Suffering for Christ’s sake should cause rejoicing because through suffering Christians further identify with Christ. Sharing in the sufferings of Christ results in (a) joy with Christ (the word overjoyed is trans. “rejoice” in 1 Peter 1:6), (b) fellowship with Him (Philippians 3:10), (c) being glorified with Him (Romans 8:17), and (d) reigning with Him (2 Timothy 2:12) - BKC