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Of course the falsity of the fact that you believe it is red implies that you don't believe it is red. But this does not mean that you believe it is not red!

— Raymond Smullyan An Epistemological Nightmare (1982)

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More quotes by Raymond Smullyan

There is nothing like a naturalistic orientation to dispel all these morbid thoughts of "sin" and "free will" and "moral responsibility."

Is God a Taoist? (1977)

Humor could not flourish in a wholly serious and rational atmosphere.

Planet Without Laughter (1980)

Medical opinions differed as to the cause of this "humor" disease.

Planet Without Laughter (1980)

I have free will, but not of my own choice. I have never freely chosen to have free will. I have to have free will, whether I like it or not!

Is God a Taoist? (1977)

From what little was known about the subject, insincerity itself was regarded as another form of psychosis but one which was exceedingly rare.

Planet Without Laughter (1980)

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Attribution

Quote text and notes from Wikiquote: Raymond Smullyan (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.