1 Corinthians 9:25-27

ECB(i) 25 And everyone who agonizes for the mastery is self-controlled in all: they indeed, to take a corruptible wreath; but we an incorruptible. 26 So thus I run - not as uncertainly; thus I fistfight - not as one flogging the air: 27 but I subdue my body and bring it to servitude: lest somehow, having preached to others, I myself become disapproved.