Bible Verses About Self-Denial: Danger of neglecting

whoever wants to save his own life will destroy it, but whoever destroys his life for my sake will find it.

What good will it do someone if he gains the whole world but forfeits his life? Or, what can a person give in exchange for his life?

I treat my body hard and make it my slave so that, after proclaiming the Good News to others, I myself will not be disqualified.