Non hanno gli huomini maggior nimico che la troppa prosperità, perchè gli fa impotenti di se medesimi, licentiosi et arditi al male, e cupidi di turbare il ben proprio con cose nuove.

Translation: Men have no greater enemy than excessive prosperity, for it destroys their mastery over themselves and makes them licentious and vicious, with a hankering after novelties destructive of their own well-being. | Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 376.