If you truly have a passion for what you do, you will care even about the parts unseen.

On Startups: "I hate it when people call themselves "entrepreneurs" when what they're really trying to do is launch a startup and then sell or go public, so they can cash in and move on.

If you act like you can do something, then it will work.

Sometimes, to relieve stress, he would soak his feet in the toilet, a practice that was not as soothing for his collegues.

Terrorism is a horrible thing that is the great threat to civilization on our planet.

Leonardo da Vinci had such a playful curiosity. If you read his notebooks, you'll see he's curious about what the tongue of a woodpecker looks like, but also why the sky is blue, or how an emotion forms on somebody's lips. He understood the beauty of everything. I've admired Leonardo my whole life, both as a kid who loved engineering - he was one of the coolest engineers in history - and then as a college student, when I travelled to see his notebooks and paintings.

I've asked Jobs why he didn't get an operation then and he said, 'I didn't want my body to be opened... I didn't want to be violated in that way.'