(Andy Roddick's) a different kind of guy. I don't spend a lot of time with him. His coach in the past (Tarik Benhabiles), I didn't have a lot of time for at all. He was a bigger problem than Andy.

That's when you've got to grit your teeth and hang in there and try and find a way to win when you're not playing your best tennis - that's what I can be proud of

Even when I was No. 1 in the world, I was taking it one match at a time. I never was a player to look too far ahead, the way draws can pan out.

When I go out to play, I still believe I'm as good as anyone out there. I don't have to prove anyone wrong. I know what I've done and how well I can play.

I'm fortunate: I can play as long as I want to play. There's no coach or trainer who is going to say to me that I'm dropped or sacked, it's time to move on. I can play as long as I want to play.

Matches are won and lost so many times in the locker room.

When I was a kid in Adelaide, I dreamed of becoming No. 1 in the world, winning a grand slam and the Davis Cup for Australia.

I was lucky enough to win the Davis Cup in my first year in 1999. I won my first slam at the U.S. Open in 2001 and became world No. 1 later that year. By the age of 20, I'd done it all.

I'm not a guy who needs to read motivation books.

Everyone has to call 'time' at some stage.

That's what you do all the hard work for, to play in situations that put your body through gruelling times. If you're not up to it, pull out.

Important decisions that will affect a nation’s fate or humanity’s fate cannot be left to the referendums! Because such decisions require good knowledge of history

Philosophy begins in wonder. And, at the end, when philosophic thought has done its best, the wonder remains.

Knowing what you don't know is more useful than being brilliant.

I have a terrible habit of shopping after I go to the gym or hitting eBay.

Power politics is the diplomatic name for the law of the jungle.

Life is the will to power; our natural desire to dominate and reshape the world to fit our own preferences and assert our personal strength to the fullest degree.

As they say in Corsica... Goodbye!

If one is sufficiently lavish with time, everything possible happens.

I love the president Donald Trump. He supports law enforcement and I'm very humbled. I said publicly, recently, pardon or no pardon, I will be with him until the end.

I think when Aristotle said that man is a political animal, he was really saying that man is a pack animal.