“Ignorance is curable, stupid is forever.”

“Never underestimate the power of human stupidity.”

“A generation which ignores history has no past — and no future.”

“You have attributed conditions to villainy that simply result from stupidity.”

“in a matter of some generations all the stupid ones will die out and those with your discipline will inherit the Earth”

“With just a touch more self confidence and a liberal helping of ignorance I could have been a famous evangelist.”

“Sin lies only in hurting other people unnecessarily. All other "sins" are invented nonsense. (Hurting yourself is not sinful -- just stupid.)”