1Co 9:24-27 NASB
24 Do 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.
25 Everyone who competes in the games exercises self-control in all things. They then do it to receive a perishable wreath, but we an imperishable.
26 Therefore I run in such a way, as not without aim; I box in such a way, as not beating the air;
27 but I discipline my body and make it my slave, so that, after I have preached to others, I myself will not be disqualified.