“Ignorance is not stupidity, but it might as well be.”

“Yes, it is true that sometimes unusually intelligent and sensitive children can appear to be stupid. But stupid children can sometimes appear to be stupid as well. I think that's something you might have to consider.”

“If you're going to do something stupid—and we all do—it might as well be a brave and foolish thing.”

“Ignorance is curable, stupid is forever.”

“Unknowing ignorance is preferable to informed stupidity.”

“Stupid people always ignored good advice”

“Fear and realisation of ignorance, strong medicines against stupid pride.”

“Obedience to public authority ought not to be based either on ignorance or stupidity.”

“Avoidable human misery is more often caused not so much by stupidity as by ignorance, particularly our ignorance about ourselves.”

“I am not sure that I do not begin to like the correction of a mistake, even when it involves my having shown much ignorance and stupidity, as well as I like hitting on a new idea.”