Learning by doing is the only way I know how to learn.

I've been working with contractors designing and building a house on a nonstop basis since I learned about all these systems of audio, construction, electricity, energy, water systems.

We built the iPod in weeks. It had to be what I thought it was going to be because there wasnt time for endless refinements.

It's easy to solve a problem that everyone sees, but it's hard to solve a problem that almost no one sees.

We're thrilled to join Google. With their support, Nest will be even better placed to build simple, thoughtful devices that make life easier at home, and that have a positive impact on the world.

Learn by doing. Learn through experiences. And this goes back to Steve Jobs' thing - which is the way you open up your knowledge of the world is by discovering it and learning about it, not through books, but by being there.

If you're not having doubt, you're not pushing the boundaries far enough.