„Take this Hercules — this hero! Hero, indeed! What was he but a large muscular creature of low intelligence and criminal tendencies!“

— Agatha Christie

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„But how much are the delicate convolutions of the brain influenced by the digestive apparatus? When the mal de mere seizes me I, Hercule Poirot, am a creature with no grey cells, no order, no method — a mere member of the human race somewhere below average intelligence!“
— Agatha Christie
„The intelligence of that creature known as a crowd is the square root of the number of people in it.“
— Terry Pratchett
„The entire evolutionary record on our planet, particularly the record contained in fossil endocasts, illustrates a progressive tendency toward intelligence. There is nothing mysterious about this: smart organisms by and large survive better and leave more offspring than stupid ones.“
— Carl Sagan
„We can lift ourselves out of ignorance, we can find ourselves as creatures of excellence and intelligence and skill.“
— Richard Bach
„It is the possibility of happiness, intelligence and power that give life its sanctity, and they are absent in the case of a poor, misshapen, paralyzed, unthinking creature.“
— Helen Keller