The laws of gravity cannot be held responcible for people falling in love.

I do not believe in immortality of the individual, and I consider ethics to be an exclusively human concern with no superhuman authority behind it.

It is better to believe than to disbelieve; in doing you bring everything to the realm of possibility.

The fear of death is the most unjustified of all fears, for there's no risk of accident for someone who's dead.

If you want the answer to anything, go sit in Nature for awhile

The stakes are immense, the task colossal, the time is short. But we may hope - we must hope - that man's own creation, man's own genius, will not destroy him.

One cannot deal with a problem with the same thinking that creates it.