"There are many who have grave scruples about deceiving but think it as nothing to deceive themselves."

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The fact that people have religious experiences is interesting from the psychological point of view, but it does not in any way imply that there is such a thing as religious knowledge...Unless he can formulate this 'knowledge' in propositions that are empirically verifiable, we may be sure that he is deceiving himself.

— A.J. Ayer