Excellence matters, and technology advances so fast that the potential for improvement is tremendous. So, since becoming CEO again, I've pushed hard to increase our velocity, improve our execution, and focus on the big bets that will make a difference in the world.

Prudent risk-taking should be encouraged by applying the concept of opportunity cost.

What I've learned is that if you really want to be successful at something, you'll find that you put the time in. You won't just ask somebody if it's a good idea, you'll go figure out if it's a good idea.

I've always said that the better off you are, the more responsibility you have for helping others. Just as I think it's important to run companies well, with a close eye to the bottom line, I think you have to use your entrepreneurial experience to make corporate philanthropy effective.

Don't spend time beating on a wall, hoping to transform it into a door.

A man who acquires the ability to take full possession of his own mind may take possession of anything else to which he is justly entitled.