The notion that inspiration requires regression and dipping into irrationality in order to access unconscious symbols and thought has been popular across disciplines for hundreds of years. Plato said that creativity is a "divine madness...a gift from the gods." Seneca recorded Aristotle as having said, "No great genius was without a mixture of insanity" (Langsdorf, 1900, pp. 90-91). One of Shakespeare's characters says, "The lunatic, the lover and the poet are of imagination all compact," and Marcel Proust said, "Everything great in the world is created by neurotics. They have composed our masterpieces.
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Creativity, the arts, and madness
Divine Madness in Ancient Greece | Historia