I think [contacting an alien civilization] would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet is not very happy, and they were the same species. I think we should keep our heads low.

One should love animals. They are so tasty.

The meaning in life is not out there but inbetween our ears. In many ways this makes us the lords of creation.

I have sold more books on physics than Madonna has on sex.

My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

Gravity is so strong that space is bent round onto itself, making it rather like the surface of the earth. If one keeps traveling in a certain direction on the surface of the earth, one never comes up against an impassable barrier or falls over the edge, but eventually comes back to where one started.

The moment you understand the whole Universe, is the moment you slightly begin to understand the way God's mind works