The world's problem is not too many people, but lack of political and economic freedom.

Human beings create more than they destroy.

We now have in our hands—really, in our libraries—the technology to feed, clothe, and supply energy to an ever-growing population for the next seven billion years.

People call me an optimist, but I'm really an appreciator ... years ago, I was cured of a badly infected finger with antibiotics when once my doctor could have recommended only a hot water soak or, eventually, surgery.... When I was six years old and had scarlet fever, the first of the miracle drugs, sulfanilamide, saved my life. I'm grateful for computers and photocopiers ... I appreciate where we've come from.

Not understanding the process of a spontaneously-ordered economy goes hand-in-hand with not understanding the creation of resources and wealth.

The main fuel to speed the world's progress is our stock of knowledge, and the brake is our lack of imagination.

All of us necessarily hold many casual opinions that are ludicrously wrong simply because life is far too short for us to think through even a small fraction of the topics that we come across.