Avarice

"Rich beyond the dreams of avarice" was an Earth saying having to do with wealth. John once uttered this before fainting, referring to the Sense Sphere being rich in molybdenum. (TV: "The Unwilling Warriors") A large lump of Jethrik could also, according to the Graff Vynda-K, make you "rich beyond the dreams of avarice". (TV: The Ribos Operation)

Behind the scenes
As one of the, avarice is the theme of Telling Tales, the sixth short story in Short Trips: Seven Deadly Sins.