1 Corinthians 9:17-19
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.
19 For though I be free from all men, yet have I made myself servant unto all, that I might gain the more.Read full chapter