1 Corinthians 9:16-19

16For if I announce the glad tidings, I have nothing to boast of; for a necessity is laid upon me; for it is woe to me if I should not announce the glad tidings.

17For if I do this voluntarily, I have a reward; but if not of my own will, I am entrusted with an administration.

18What is the reward then that I have? That in announcing the glad tidings I make the glad tidings costless [to others], so as not to have made use, as belonging to me, of my right in [announcing] the glad tidings.

19For being free from all, I have made myself bondman to all, that I might gain the most [possible].