"Thoroughly conscious ignorance is the prelude to every real advance in science."

"I saw a rat today in the college garden, and I thought how much more pleasant it would be to be a rat than a professor."

"I have been battering away at Saturn, returning to the charge every now and then. I have effected several breaches in the solid ring, and now I am splash into the fluid one, amid a clash of symbols tr…"

"The only difference between a madman and me is that I am not mad."

"The true Logic for this world is the Calculus of Probabilities, which takes account of the magnitude of the probability."