What does Paul mean by 'I affirm by your rejoicing' in 1 Corinthians 15:31?
Paul means he affirms, or protests, by the Corinthians' rejoicing in Christ Jesus that he dies daily. Even as carnal Christians, they had enough sense to rejoice in some things, and Paul uses their joy in Christ as the basis for his daily dying testimony.
Les explains that the King James renders the word as 'protest,' but a later Greek reading is 'affirm,' which makes better sense. Paul is telling the carnal Corinthian believers that he affirms—or testifies—by their rejoicing in Christ Jesus that he dies daily. Even though they were carnal, they still had enough spiritual sense to rejoice in some things. Les notes this 'I die daily' has a two-fold approach, beginning with Paul's strong teaching on the old and new nature.
I protest by your rejoicing which I have in Christ Jesus our LORD, I die daily.
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What did Paul mean by "I die daily" in 1 Corinthians 15:31?
Paul's statement "I die daily" in 1 Corinthians 15:31 is exactly what Paul is talking about in Romans 6:13 about not yielding your members to sin but yielding them to God.