What does the Latin proverb say? “No one of a sudden becomes most base”
Harding uses this quotation from Juvenal’s Satires to explain that he does not believe that Crawley, who seems to him to be a virtuous man, would suddenly steal money. Trollope’s use of this phrase is interesting since Harding references its origin in Latin literature, whereas many of the characters in his novels often unwittingly quote or paraphrase Classical texts. [EB 2006]
Sources: Juvenal, Satire 2.83.