I believe that the long-term future of the human race must be space and that it represents an important life insurance for our future survival, as it could prevent the disappearance of humanity by colonizing other planets.

I don't have much positive to say about motor neuron disease, but it taught me not to pity myself because others were worse off, and to get on with what I still could do. I'm happier now than before I developed the condition.

I believe in the possible. I believe, small though we are, insignificant though we may be, we can reach a full understanding of the universe. You were right when you said you felt small, looking up at all that up there. We are very, very small, but we are profoundly capable of very, very big things.

There is no heaven or afterlife for broken down computers; that is a fairy story for people afraid of the dark.

When I hear of Schrödinger's cat, I reach for my pistol.

Science makes God unnecessary.

I thought Eddie Redmayne portrayed me very well... At times I thought he was me.