The fight will last as long as I allow it to last.

Boxing and chess are similar. It’s about the choice of means. Sometimes I need a pawn, a bishop or a knight to defeat my opponent. It’s about finding the best way. A good boxer has to be variable. He doesn’t just need to know how to punch. He must also know how to protect himself, how to defend, how to avoid the opponent’s punches. Only a complete fighter can become champion.

Adversity is something that makes reaching your goals so much more rewarding than if it didn't exist.

For me, there's never any bad blood - unless you do something to me.

Recently I donated money to the establishment of the Muhammad Ali Foundation in Louisville. I regard that as a kind of payback. He smoothed the way for us. He wasn’t just a great person who had conviction, but made the sport of boxing great. He was the first superstar, he made our stock rise. Without him we wouldn’t have earned so much. Americans from every walk of life have contributed to the foundation: Bill Clinton, Angelina Jolie, Brad Pitt. Unfortunately I was the only American athlete to make a donation. There’s not enough respect in our business.

A great champion needs a background in amateur boxing, I’'m convinced of that. There you learn everything that you’ll need later as a pro. Someone who’s got more than 400 amateur fights behind him no longer gets nervous before going into the ring and doesn’t lose his nerve during a fight. You know all the boxing styles, you’re prepared for anything, you’ve got the pedigree that you need to be a successful pro.

A boxer should quit at the top, as they say. But that’s complicated. There are plenty of people in boxing who make money out off you. And they tell you that you’ve still got it, that it’s still getting better.