Only stupid people don't change their minds.

Stupidity is always a capital crime.

Being stupid means avoiding thinking by jumping to conclusions.

Readiness to answer all questions is the infallible sign of stupidity.

Obstinacy and vehemency in opinion are the surest proofs of stupidity.

Stupidity or reason? Oh, there was no choice now. It was imbecility every time.

Honesty always sounds like impudence to the vain and stupid.

I envy stupidity, stupidity is eternal.

Ignorance is curable, stupid is forever.

Credulity is always ridiculous.

Stupid people, people who do not know how to laugh, are always pompous and self-conceited.

Ignorance never settles a question.

When a stupid man is doing something he is ashamed of, he always declares that it is his duty.

Inhumanity is the keynote of stupidity in power.