Hamlet has just talked with his father’s ghost and learned of his uncle’s perfidy, and when Horatio calls this confrontation “wondrous strange,” Hamlet says: “And therefore as a stranger give it welcome. There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.”
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I know that one. But somebody reversed it, and the implication is that there is something worse than ignorance: the positing of things that aren’t true.