1 Corinthians 9:15-19

But I have used none of these things. And I have not written these things so that it will be done so in my case; for it would be better for me to die than that. No one shall make my boast an empty one!

For if I preach the gospel, I have nothing to boast about, for I am under compulsion; for woe to me if I do not preach the gospel.

For if I do this voluntarily, I have a reward; but if against my will, I have been entrusted with a commission nonetheless.

What, then, is my reward? That, when I preach the gospel, I may offer the gospel without charge, so as not to make full use of my right in the gospel.

For though I am free from all people, I have made myself a slave to all, so that I may gain more.