When I study philosophical works I feel I am swallowing something which I don't have in my mouth.

One must take what nature gives as one finds it.

I cannot imagine a God who rewards and punishes the objects of his creation and is but a reflection of human frailty.

One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike -- and yet it is the most precious thing we have.

I believe that pipe smoking contributes to a somewhat calm and objective judgement in all human affairs.

As a human being, one has been endowed with just enough intelligence to be able to see clearly how utterly inadequate that intelligence is when confronted with what exists.

Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.