Among other possibilities, money was invented to make it possible for a foolish man to control wise men; a weak man, strong men; a child, old men; an ignorant man, knowledgeable men; and for a dwarf to control giants.
There is nothing morally wrong with buying stolen goods, unless you know that they were stolen.
Not everyone who talks less or keeps quiet whenever they are with or around you does that because they find you interesting or knowledgeable; some people do that because they find you boring or ignorant.
The kind of lies that someone tells us gives us an idea of how stupid, knowledgeable, intelligent, or ignorant they are … or they think we are.
Some social ills are preserved by the common misbelief that things such as ignorance, greed, and stupidity do not have the stamina required to reach old age.