1 Corinthians 9:25-27

All those who compete in the games use self-control so they can win a crown. That crown is an earthly thing that lasts only a short time, but our crown will never be destroyed. So I do not run without a goal. I fight like a boxer who is hitting something—not just the air. I treat my body hard and make it my slave so that I myself will not be disqualified after I have preached to others.