Summary: He preached the Gospel not for gain but out of duty. He made himself a servant to all, adapting to each one, so that he might bring some to salvation.
Brothers and sisters: If I preach the Gospel, this is no reason for me to boast, for an obligation has been imposed on me, and woe to me if I do not preach it! If I do so willingly, I have a recompense, but if unwillingly, then I have been entrusted with a stewardship. What then is my recompense? That, when I preach, I offer the Gospel free of charge so as not to make full use of my right in the Gospel.
Although I am free in regard to all, I have made myself a slave to all so as to win over as many as possible. To the weak I became weak, to win over the weak. I have become all things to all, to save at least some. All this I do for the sake of the Gospel, so that I too may have a share in it.