Recently a quote popped into my head, which I recall as a Bishop Berkeley proposition. But on further looking into the matter, I can't seem to find it. It's within the general area of the following:
"There is no opinion so invalid, no doctrine so false, that it does not contain a modicum of truth."
All leads and suggestions appreciated!
I happened on the answer to your question.
The quotation is "Nihil tam absurde dici potest quod non dicatur ab aliquo filosophorum" (There is nothing so absurd but some philosopher has said it - Cicero, De Divinatione, II, 58.
I confirmed it at Imperium Romanum - Quotes of Cicero