I flew home with this profound sense of the simultaneity of human suffering; I've never been able to get over that sense that even as I'm talking to you right now, there are people who are living unbearable lives.

My grandfather and his generation were told this was their finest hour, and it's strange isn't it… some of our finest hours are the most heartbreaking. In war, you watch your friends die, you are forced to take a life and protect life, and that reality is often played back to you as a soldier as being part of your finest hour.

Nobody knows how far we can go as humans and so I listened only to myself and my body and pushed it to go beyond perceived limitations, and guess what – outside that boundary is a whole new life where you really start to live.

My hands have been known mostly for the leather gloves that I've used as an instrument to punish opposing fighters. Outside the ring, though, I want my legacy to be the man with bare hands that offered kindness and hope to those in need.

If you take care of this dualistic biological soul, your immune system, and nurture it, you can live to well-beyond 100 years of age. In fact, my belief is that in the next 50 years we'll see people easily living to 130-150 based on sheer medication availability and nurturing their biology.