"The difference between the poet and the mathematician is that the poet tries to get his head into the heavens while the mathematician tries to get the heavens into his head."
"A dead thing goes with the stream, but only a living thing can go against it."
"Science must not impose any philosophy, any more than the telephone must tell us what to say."
"There is a great deal of difference between an eager man who wants to read a book and a tired man who wants a book to read."
"Merely having an open mind is nothing. The object of opening the mind, as of opening the mouth, is to shut it again on something solid."
"I always like a dog so long as he isn't spelled backward."