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"Here at Wisconsin we didn't get an undergraduate course in mathematical logic until the '60s."
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"Many people have said to me that I'm a mystic. I find that a bit mysterious. I just use logic and common sense for my philosophies."

"Logic, n. The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding. The basic of logic is the syllogism, consisting of a major and a minor premise and a conclusion - thus:Major Premise: Sixty men can do a piece of work sixty times as quickly as one man.Minor Premise: One man can dig a post-hole in sixty seconds; Therefore-Conclusion: Sixty men can dig a post-hole in one second.This may be called syllogism arithmetical, in which, by combining logic and mathematics, we obtain a double certainty and are twice blessed."

"There is no logic in logics except an illogical logic."

"Rationality and common sense never goes out of fashion."

"Apriority creates ambiguities among ideas."

"But twice-two-makes-four is for all that a most insupportable thing. Twice-two-makes-four is, in my humble opinion, nothing but a piece of impudence. Twice-two-makes-four is a farcical, dressed-up fellow who stands across your path with arms akimbo and spits at you."
Explore more quotes by Stephen Cole Kleene

"I don't think Post often came to Princeton during the '30s. I can't remember ever seeing him in Princeton."

"When I got to Princeton I made a point of attending the Philosophy Club and listening to the lectures, but I didn't get involved in any discussions in those clubs. I guess after the first year, I dropped that."

"The job in Wisconsin was the first genuine offer of an academic job in a university which I received."

"I think that after Church got his Ph.D. he studied in Europe, maybe in the Netherlands, for a year or two."

"And what I learned in Church's course. He trained us intensively in his new system, which he was just developing. Two papers were presented. I think the second paper wasn't published until well after the course was finished."

"I had a liberal arts education at Amherst College where I had two majors, mathematics and philosophy."

"I went to Princeton from Amherst, where I split my interests between mathematics and philosophy."
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