Great leaders don't blame the tools they are given. Great leaders work to sharpen them.

When you compete against everyone else, no one wants to help you. But when you compete against yourself, everyone wants to help you.

Simple ideas are easier to understand. Ideas that are easier to understand are repeated. Ideas that are repeated change the world.

No one knows everything. But together, we know a whole lot.

What's important to me is that I put messages out, whether it's a TED talk, whether it's a book.

The primary ingredient for progress is optimism. The unwavering belief that something can be better drives the human race forward.

People have accused me of only working with good companies. No I don't. I work with some very dysfunctional companies or unbelievably dysfunctional organizations. The people that bring me in know what they're doing won't work for the future. They know they want to change and they want to change for the right reasons. They believe what I believe and that's why they called me.