I Corinthians 9:24-27

²⁴Do you not know that those who run in a race all run, but only one receives the prize? Run in such a way that you may win. ²⁵Everyone who competes in the games exercises self-control in all things. They then do it to receive a perishable wreath, but we an imperishable. ²⁶Therefore I run in such a way, as not without aim; I box in such a way, as not beating the air; ²⁷but I discipline my body and make it my slave, so that, after I have preached to others, I myself will not be disqualified.