1 Corinthians 9:17-19

New Revised Standard Version, Anglicised Catholic Edition

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 proclamation I may make the gospel free of charge, so as not to make full use of my rights in the gospel.

¹⁹ For though I am free with respect to all, I have made myself a slave to all, so that I might win more of them.