1 Coríntios 9

24 have ye not known that those running in a race -- all indeed run, but one doth receive the prize? so run ye, that ye may obtain;

25 and every one who is striving, is in all things temperate; these, indeed, then, that a corruptible crown they may receive, but we an incorruptible;

26 I, therefore, thus run, not as uncertainly, thus I fight, as not beating air;

27 but I chastise my body, and bring [it] into servitude, lest by any means, having preached to others -- I myself may become disapproved.