E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Beggar.
A beggar may sing before a pickpocket. (In Latin, Cantabit vacuus coram latrone viator.) A beggar may sing before a highwayman because he has nothing in his pocket to lose.
1
Set a beggar on horseback, and hell ride to the deil. There is no one so proud and arrogant as a beggar who has suddenly grown rich.
2
Such is the sad effect of wealthrank pride
Mount but a beggar, how the rogue will ride!
Peter Pindar: Epistle to Lord Lonsdale.
Latin: Asperius nihil est humili cum surgit in altum.
3
French: Il nest orgueil que de pauvre enrichi.
4
Italian: Il vilan nobilitado non connosce il parentado (A beggar ennobled does not know his own kinsmen).
5
Spanish: Quando el villano está en el mulo, non conoze a dios, ni al mundo (when a beggar is mounted on a mule, he knows neither gods nor men).