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Nothing is True Everything is Permitted
Origin
This idiomatic expression originates from Friedrich Nietzsche, the famous philosopher who wrote the phrase in his 1859 book, “The Geneology of Morals.” However, Nietzsche attributes the phrase’s origin to Hassan-i-Sabbah, the leader of the historical Assassins. This sect was a part of Isma’ili and Shia Islam. However, there is no verified proof of these claims.
Maybe not the best source https://english-grammar-lessons.com/nothing-is-true-everything-is-permitted-meaning/
Good story