1 Corinthians 9:17-19 New King James Version (NKJV)
17 For if I do this willingly, I have a reward; but if against my will, I have been entrusted with a stewardship. 18 What is my reward then? That when I preach the gospel, I may present the gospel [a]of Christ without charge, that I may not abuse my authority in the gospel.
Serving All Men
19 For though I am free from all men, I have made myself a servant to all, that I might win the more;
1 Corinthians 9:17-19 New International Version (NIV)
17 If I preach voluntarily, I have a reward; if not voluntarily, I am simply discharging the trust committed to me. 18 What then is my reward? Just this: that in preaching the gospel I may offer it free of charge, and so not make full use of my rights as a preacher of the gospel.
Paul’s Use of His Freedom
19 Though I am free and belong to no one, I have made myself a slave to everyone, to win as many as possible.