Leonardo da Vinci did not take received wisdom - whether from ancient classical thinkers or medieval scholars or from the Bible - without questioning it. And this was the beginning of the scientific method. This is another lesson for our time: that when we have evidence that contradicts a certain belief, we should be willing to change it. I think this made Leonardo, in some ways, a person who better understood the beauty of God's creation than a person who just takes all received wisdom from the Bible on faith.

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

People who know what they’re talking about don’t need PowerPoint.

I used to be an angry man myself. I’m a recovering assaholic so I could recognize that in Steve. (quoting Jean-Louis Gassée)

Asked about the fact that Apple's iTunes software for Windows computers was extremely popular, Jobs joked, 'It's like giving a glass of ice water to somebody in hell.

Without Steve Jobs, you would have well-designed computers, probably open and not integrated, but they wouldn't have sex appeal, they wouldn't have romance.

I think Leonardo da Vinci teaches us the value of both being focused on things that fascinate us but also, at times, being distracted and deciding to pursue some shiny new idea that you happen to stumble upon. Balancing intense focus with being interested in a whole lot of different things is something that we have to do in the Internet age.