16 For if I preach the gospel, that gives me no ground for boasting. For necessity is laid upon me. Woe to me if I do not preach the gospel! 17 For if I do this of my own will, I have a reward; but if not of my own will, I am entrusted with a commission. 18 What then is my reward? Just this: that in my preaching I may make the gospel free of charge, not making full use of my right in the gospel.

19 For though I am free from all men, I have made myself a slave to all, that I might win the more.