1 Corinthians 9:25-27

25Everyone who 1competes in the games exercises self-control in all things. So they do it to obtain a perishable 2wreath, but we an imperishable.

26Therefore I 3run in such a way as not to run aimlessly; I box in such a way, as 4to avoid 5hitting air;

27but I strictly discipline 6my body and make it my slave, so that, after I have preached to others, I myself will not be disqualified.