Bible Verses About Self-Denial: Danger of neglecting

For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.

For what is a man profited, if he shall gain the whole world, and lose his own soul? or what shall a man give in exchange for his soul?

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.