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.

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'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.

I'm one injury away from hanging up the racket at any time.

Faith is always supposed to make it harder, not easier, to ignore the plight of our sisters and brothers. (p. 165)

Kindness is something that should always be passed on.

So the fact that I’m me and no one else is one of my greatest assets. Emotional hurt is the price a person has to pay in order to be independent.

Patience is moral elasticity.

Faithful to the word given and the idea had.

Who was the fool, who the wise man, beggar or king? Whether poor or rich, all's the same in death.

Part-black generally means all-black in Americans' minds. Just as part-Asian or part-Hispanic or part-anything-else usually puts individuals in those minority-groups' camps.

Gene Richards swings, the ball bounces foul and hits him in the head. No harm done.

Criticism is concerned with evaluation. There may be evaluative principles implicit in this or that form of theory, but theory in and of itself is not prescriptive.

In his 1930 book, Dirac took for granted that measurements could be made, but was very vague about what was actually involved.