I'm always doubtful. Everything I do is always doubtful. When you're trying to differentiate, there's going to be this gut sense, is this right? If you're not having doubt, then you're not pushing it hard enough, or you're not looking at the details close enough. You need to be feeling that doubt every single day.

The truth is, homes change over time — and technology has to adapt, not try to do everything at once.

Even if you have constrained resources, don't cut corners. People will feel it.

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.

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

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.

Every person I talk to has a story about how their smoke alarm went off or woke them up with a battery beeping. So you take it off the wall and you take the battery out and say screw this. They hate the products.