Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize.  Everyone who competes in the games goes into strict training. They do it to get a crown that will not last, but we do it to get a crown that will last forever.  Therefore I do not run like someone running aimlessly; I do not fight like a boxer beating the air.  No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.

1 Corinthians 9:24-27