Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities; Truth isn’t.
Mark Twain (1835-1910) American writer [pseud. of Samuel Clemens] Following the Equator, ch. 15, epigraph, “Pudd’nhead Wilson’s New Calendar” (1897)
(Source)
Sometimes paraphrased, "Why shouldn't truth be stranger than fiction? Fiction, after all, has to make sense." More on this quotation and its variants here.
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