Science is what we know, and philosophy is what we don't know.

Man is the product of causes which had no prevision of the end they were achieving; his origin, his growth, his hopes and fears, his loves and beliefs, are but the outcome of accidental collocations of atoms; no fire, no heroism, no intensity of though and feeling, can preserve an individual life beyond the grave.

There's a Bible on that shelf there. But I keep it next to Voltaire - poison and antidote.

Science, in its ultimate ideal, consists of a set of propositions arranged in a hierarchy, the lowest level of the hierarchy being concerned with particular facts, and the highest with some general law, governing everything in the universe. The various levels in the hierarchy have a two-fold logical connection, travelling one up, one down; the upward connection proceeds by induction, the downward by deduction.

The key to happiness is accepting one unpleasant reality every day.

I did not, however, commit suicide, because I wished to know more of mathematics.

The infliction of cruelty with a good conscience is a delight to moralists - that is why they invented hell.