I think you need inspiration, motivation from different angles to keep you going, because it isn't that simple just to wake up every morning and go for another travel around the world, another practice, all these other things; another fitness workout, another stretch. It's always nice, but you need to have some success and you need to have the right reasons why you're doing it. I think I've always been able to do that and I really enjoy myself out on the court.
Tennis - ATP World Tour - London 2012 Final - Federer Inspired By Love For The Game