The beatings will continue until morale improves.

Maybe I don't have the most common kind of motor neuron disease, which usually kills in two or three years.

One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn't exist.....Without imperfection, neither you nor I would exist

Because imaginary time behaves like another direction in space, histories in imaginary time can be closed surfaces, like the surface of the Earth, with no [existential] beginning or end.

When the going gets tough, the tough take a coffee break.

If what we regard as real depends on our theory, how can we make reality the basis of our philosophy? But we cannot distinguish what is real about the universe without a theory. It makes no sense to ask if it corresponds to reality, because we do not know what reality is independent of a theory.

A million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.