Sometimes it's boring because it takes time, but it's enjoyable. So beating up people for a living is really fun.

Obsession is love in an extreme shape.

Who's gonna win between two brothers? The Klitschko mother's gonna win because she said it won't happen.

I prepare for my fights to well that I don't wanna give a chance to my opponent to crash my 'glass chin' as they say, so I'm knocking them in the way that I like.

From nothing to everything is a long way, from everything to nothing is one stop.

I learned in my Ph.D. the discipline I needed to be successful. Most boxers are not that disciplined. They have talent, but the self-organization - the ability to schedule yourself and your priorities - is lacking. My studies were about the control of training on both the psychological and the physical side.

I think that there's only one nationality and one language in the sport, and you call it performance.