There is nothing so absurd that it has not been said by some philosopher.
Nihil tam absurde dici potest, quod non dicatur ab aliquo philosophorum.
Original text (Latin)
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Notes from Wikiquote
Book II, chapter LVIII, section 119 | Cf. René Descartes' "On ne sauroit rien imaginer de si étranger et si peu croyable, qu'il n'ait été dit par quelqu'un des philosophes [One cannot conceive anything so strange and so implausible that it has not already been said by one philosopher or another]" (Le Discours de la Méthode, Pt. 2)