1 Corinthians 9:25-27

A true athlete will be disciplined in every respect, practicing constant self-control in order to win a laurel wreath that quickly withers. But we run our race to win a victor’s crown that will last forever. For that reason, I don’t run just for exercise or box like one throwing aimless punches, but I train like a champion athlete. I subdue my body and get it under my control, so that after preaching the good news to others I myself won’t be disqualified.