“There is nothing so absurd but some philosopher has said it.”
Nihil tam absurde dici potest, quod non dicatur ab aliquo philosophorum.
Marcus Tullius Cicero book De Divinatione
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)
Variant: There is nothing so ridiculous that some philosopher has not said it.
Source: De Divinatione – On Divination (44 BC)
