It's important to get under your opponent's skin and let them know that you are coming for them out in the middle. When you do that, half the battle's won!
Right from the start of my career I was surrounded by people like Jacques Kallis, Mark Boucher and Graeme Smith, who gave 100 percent in every performance.
If you want to bowl a yorker, you have to land it; if you want to bowl a bouncer you have to be on the money.
If you're playing Test cricket you could bowl 20 overs in a day. I could play about five T20s in that space.
There's a lot of guys who can bowl 150 km/h when you give them the ball when they're fresh in the morning, but can they do it late in the afternoon when it's boiling hot and they're bowling their 20th over for the day? I want to be able to do that and I want to be the only guy who is able to do that.
When I am off the field, I am the calm, very quiet kind of easy-sailing ocean, and then when I am on a hot streak with a cricket ball, I can be the most disastrous waters you have ever been in.
It's enough to play for South Africa and take wickets for South Africa, and then I managed to get 400. I never thought that that would happen.
If you are playing in the right conditions, there is always motivation to bowl fast. If you are playing in the wrong condition then you want to be a batsman.
It's very easy to say take a player, a world-class player out of the system of playing and just push him into a coaching role but coaching is a whole other thing. It's a skill.
Someone like Shane Warne played the game on and off the field really well and got into guys' heads. Even though he couldn't bounce you and hurt you physically, he was verbally aggressive and would let you know he'd get you out. He made batsmen doubt themselves. I learned from players like him and made a point of incorporating it into my own game.