Bible Verses About Self-Denial: Paul

but I make account of none of these, neither do I count my life precious to myself, so that I finish my course with joy, and the ministration that I received from the Lord Jesus, to testify fully the good news of the grace of God.

for being free from all men, to all men I made myself servant, that the more I might gain;

but I chastise my body, and bring it into servitude, lest by any means, having preached to others--I myself may become disapproved.