You can't be everybody's friend, you can't save the world, I learned this word: self-preservation. Once you do that, you can be friends with people, but how would you be a friend to anybody if you're not a friend to yourself.

Not to be egotistical, but I don't think there is a man on this planet who can beat me

You have to feel comfortable being uncomfortable. I'm always comfortable being uncomfortable. And to be comfortable being uncomfortable, I have to hone my discipline, which to me is doing what I have to do, but also doing it like I love it.

I paid a worker at New York's zoo to re-open it just for me and Robin (his wife). When we got to the gorilla cage there was 1 big Silverback gorilla there just bullying all the other gorillas. They were so powerful but their eyes were like an innocent infant. I offered the attendant $10,000 to open the cage and let smash that silverback's snotbox! He declined.

I was an emotional manipulator of fighters . . . You have to know how to be cold, you know? Just have no -emotions, no feelings. It takes time, though, to develop that. I'd been working on that since I was 12 years old. It doesn't happen overnight.

I'm the biggest fighter in the history of the sport. If you don't believe it, check the cash register.

My career has been over since 1990.