1 Corinthians 9:22-27

22To the weak I became weak, that I might gain the weak: I am become all things to all men, that I may by all means save some. 23And I do all things for the gospel’s sake, that I may be a joint partaker thereof. 24Know ye not that they which run in a race run all, but one receiveth the prize? Even so run, that ye may attain. 25And every man that striveth in the games is temperate in all things. Now they do it to receive a corruptible crown; but we an incorruptible. 26I therefore so run, as not uncertainly; so fight I, as not beating the air: 27but I buffet my body, and bring it into bondage: lest by any means, after that I have preached to others, I myself should be rejected.