Bible: 1 Corinthians 9:16-18
9:16 For if I preach the gospel, I have no reason for boasting, because I am compelled to do this. Woe to me if I do not preach the gospel! 9:17 For if I do this voluntarily, I have a reward. But if I do it unwillingly, I am entrusted with a responsibility. 9:18 What then is my reward? That when I preach the gospel I may offer the gospel free of charge, and so not make full use of my rights in the gospel.
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