Man is a rational animal who always loses his temper when called upon to act in accordance with the dictates of reason.
– Oscar Wilde
It has been said that man is a rational animal. All my life I have been searching for evidence which could support this.
– Bertrand Russell
Aristotle defined human beings as rational animals. Seems reasonable enough. Any animals capable of rationality are therefore human beings, and any incapable of it are not.
It follows that there are creatures not members of the species Homo sapiens sapiens that are human… and some members of the species that are not.
“Ever sift sand through a screen?” she asked.
The tangential slash of her question shocked his mind into a higher awareness: Sand through a screen. He nodded.
“We Bene Gesserit sift people to find the humans.”
– Exchange between Reverend Mother Gaius Helen Mohiam and Paul Atreides, Frank Herbert, Dune