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Chemically induced hallucinations, delusions and raptures may be frightening or wonderfully gratifying; in either case they are in the nature of confidence tricks played on one's own nervous system.

— Arthur Koestler Return Trip to Nirvana from The Sunday Telegraph (1967)

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More quotes by Arthur Koestler

Einstein's space is no closer to reality than Van Gogh's sky.

The Act of Creation (1964)

Men cannot be treated as units in operations of political arithmetic because they behave like the symbols for zero and the infinite, which dislocate all mathematical operations.

The more original a discovery the more obvious it seems afterwards.

The Act of Creation (1964)

Creative activity could be described as a type of learning process where teacher and pupil are located in the same individual.

Drinkers of Infinity: Essays 1955-1967 (1967)

Coincidence may be described as the chance encounter of two unrelated causal chains which — miraculously, it seems — merge into a significant event.

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