If you understand how the universe operates, you control it in a way.

We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics.

I think the next [21st] century will be the century of complexity. We have already discovered the basic laws that govern matter and understand all the normal situations. We don't know how the laws fit together, and what happens under extreme conditions. But I expect we will find a complete unified theory sometime this century. The is no limit to the complexity that we can build using those basic laws.

I have lived with the prospect of an early death for the last 49 years. I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first. I regard the brain as a computer which will stop working when its components fail. There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.

If time travel is possible, where are the tourists from the future?

It is all right to make mistakes; nothing is perfect because with perfection, we would not exist.

Intelligence is the ability to adapt to change.