1 Corinthians 9:24-27

Don’t you know that the runners in a stadium all race, but only one receives the prize? Run in such a way to win the prize. Now everyone who competes exercises self-control in everything. They do it to receive a perishable crown, but we an imperishable crown. So I do not run like one who runs aimlessly or box like one beating the air. Instead, I discipline my body and bring it under strict control, so that after preaching to others, I myself will not be disqualified.