Know ye not that they which run in a race run all;
but one receiveth the prize? 
So run, that ye may obtain.
And every man that striveth for the mastery
is temperate in all things. 
Now they do it to obtain a corruptible crown;
but we an incorruptible.

I therefore so run, not as uncertainly;
so fight I, not as one that beateth the air:
But I keep under my body,
and bring it into subjection:
lest that by any means,
when I have preached to others,
I myself should be a castaway.

1 Corinthians 9:24-27