1 Corinthians 9:15-9:18
15. But I have used none of these things: neither have I written these things, that it should be so done unto me: for it were better for me to die, than that any man should make my glorying void.
16. For though I preach the gospel, I have nothing to glory of: for necessity is laid upon me; yea, woe is unto me, if I preach not the gospel!
17. For if I do this thing willingly, I have a reward: but if against my will, a dispensation of the gospel is committed unto me.
18. What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel.
Bailey, Paul through Mediterranean Eyes, 249, 250, ABCDCBA.