It's exciting to see how fast your kids learn and grow. I'm not too worried about them, particularly the ones who like to break rules and don't follow instructions; those are the ones that will do just fine because they know what's important to them.

If you want to sustain excellence over a long time, you'd better come up with a system that works well. Anyone can sprint for a little while, but you can't sprint for forty years.

Our business is about technology, yes. But it's also about operations and customer relationships.

Today the world lost a visionary leader, the technology industry lost an iconic legend and I lost a friend and fellow founder. The legacy of Steve Jobs will be remembered for generations to come. My thoughts and prayers go out to his family and to the Apple team.

I have no doubt that in the future, wearable devices like Fitbit will know my blood pressure, hydration levels and blood sugar levels as well. All of this data has the potential to transform modern medicine and create a whole new era of personalized care.

One of the things I benefited from when I started this business was that I didn't know anything. I was just instinct with no preconceived notions. This enabled me to learn and change quickly without having to worry about maintaining any kind of status quo, like some of my bigger competitors.

If you have to go through life being unhappy to conform to society around you, that's not a very good deal.