One mark of a great mind is the willingness to change it. We can see that in Leonardo. As he wrestled with his earth and water studies during the ear… - Walter Isaacson

I never worried about money. I grew up in a middle-class family, so I never thought I would starve. And I learned at Atari that I could be an okay engineer, so I always knew I could get by. I was voluntarily poor when I was in college and India, and I lived a pretty simple life even when I was working. So I went from fairly poor, which was wonderful, because I didn’t have to worry about money, to being incredibly rich, when I also didn’t “have to worry about money.
I watched people at Apple who made a lot of money and felt they had to live differently. Some of them bought a Rolls-Royce and various houses, each with a house manager and then someone to manage the house managers. Their wives got plastic surgery and turned into these bizarre people. This was not how I wanted to live. It’s crazy. I made a promise to myself that I’m not going to let this money ruin my life.

You read everything — that’s part of the job,” he said. “You accumulate all this trivia, and you hope that someday maybe a millionth of it will be useful.

"On the day he unveiled the Macintosh, a reporter from Popular Science asked Jobs what type of market research he had done. Jobs responded by scoffing, "Did Alexander Graham Bell do any market research before he invented the telephone?