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

— Robert A. Heinlein

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„Stupidity is the same as evil if you judge by the results.“
— Margaret Atwood
„Ignorance means you didn’t have the necessary knowledge. A person can hardly be blamed for that. Stupidity is the result of knowing what to do but not acting upon that knowledge.“
— John C. Maxwell
„You don't have to be stupid to be a Christian,… but it probably helps.“
— Ambrose Bierce
„It is stupid to hope, but sometimes hope is all you have.“
— Cassandra Clare
„Rod…were you born that stupid? Or did you have to study?“
— Robert A. Heinlein
„Remorse.-- Never yield to remorse, but at once tell yourself: remorse would simply mean adding to the first act of stupidity a second.“
— Friedrich Nietzsche