While there's life, there is hope.

The laws of science, as we know them at present, contain many fundamental numbers, like the size of the electric charge of the electron and the ratio of the masses of the proton and the electron .... The remarkable fact is that the values of these numbers seem to have been finely adjusted to make possible the development of life.

The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order, which may or may not be divinely inspired.

Equations are just the boring part of mathematics. I attempt to see things in terms of geometry.

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

If one is physically disabled, one cannot afford to be psychologically disabled as well.

We are entering an increasingly dangerous period of our history. But I'm an optimist.