1 Corinthians 9:16-23 (ESV)

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 still entrusted with a stewardship. ¹⁸ What then is my reward? That in my preaching I may present the gospel free of charge, so as not to make full use of my right in the gospel.

¹⁹ For though I am free from all, I have made myself a servant to all, that I might win more of them. ²⁰ To the Jews I became as a Jew, in order to win Jews. To those under the law I became as one under the law (though not being myself under the law) that I might win those under the law. ²¹ To those outside the law I became as one outside the law (not being outside the law of God but under the law of Christ) that I might win those outside the law. ²² To the weak I became weak, that I might win the weak. I have become all things to all people, that by all means I might save some. ²³ I do it all for the sake of the gospel, that I may share with them in its blessings.