Paul reminds the Corinthians of the real hope that is theirs in Christ. Their hope does not lie in this world (although the rest of the letter suggests that many of them have been carried away by worldly pursuits). Their hope lies in God’s commitment to keep them strong and to make them appear guiltless before him on the day of Christ’s return.
8 who will sustain you to the end, guiltless in the day of our Lord Jesus Christ.