Au revoir! = Till we meet again.
Richesse
La richesse rend honnête = Rich men have no faults.
[The bishop’s pun may be repeated: “Get on, get honour, get honest.”
“Quand on est couronnée, on a toujours le nez bien fait.”—Perrault, Les Souhaits ridicules.]
Rien
“Dans le siècle où nous sommes,
On ne donne rien pour rien”
= At the present day people give nothing for nothing, and precious little for sixpence.
[Molière, École des Femmes, iii. 2. Rien here shows its derivation from rem (a thing). It was not always used with ne.]
Ne faites semblant de rien = Look as if nothing were the matter.