Commonly said in Medieval debates and referring to Aristotle. Used in general to emphasize that some assertion comes from some authority, i.e., as an argument from authority, and the term ipse-dixitism has come to mean any unsupported rhetorical assertion that lacks a logical argument. A literal translation by Cicero (in his De Natura Deorum 1.10) of the Greek «αὐτὸς ἔφα», an invocation by Pythagoreans when appealing to the pronouncements of the master.
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