Everyone has to call 'time' at some stage.

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.

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.

We were both filled with the enthusiasm that comes from being with someone you automatically click with.

What we see, we see and seeing is changing

The new rebels might be artists willing to risk the yawn, the rolled eyes, the cool smile, the nudged ribs, the parody of gifted ironists, the ‘Oh how banal.’

I also think you have less separation if you are fuller. If you go to the gym and pump your arms up they are bigger because of the blood volume, the fullness. But the separation is not so defined.

An interesting piece of work, freely chosen, which has the virtue of inducing concentration rather than fatigue, adds to the child's energies and mental capacities, and leads him to self-mastery.

I saw people around me who were falling deeper and deeper into alcoholism and substance abuse. It's seductive because alcohol is amazing and drugs are amazing, they work so well.

We sometimes congratulate ourselves at the moment of waking from a troubled dream; it may be so the moment after death.

When I sleep every night, what am I called or not called? And when I wake, who am I if I was not I while I slept?

The first step to delighting your customers is being there when they need you.

Your absence has gone through me