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24Don`t you know that those who run in a race all run, but one receives the prize? Run like that, that you may win. 25Every man who strives in the games exercises self-control in all things. Now they do it to receive a corruptible crown, but we an incorruptible. 26I therefore run like that, as not uncertainly. I fight like that, as not beating the air, 27but I beat my body and bring it into submission, for fear that by any means, that after I have preached to others, I myself should be rejected.
1 Corinthians 9:24-27 (WEB)