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Rational animal is a classical definition of humanity, often (though mistakenly) attributed to Aristotle's Metaphysics: however, in the Nicomachean Ethics I.13, Aristotle states that the human being has a rational principle, on top of the nutritive life shared with plants, and the instinctual life shared with other animals, i.e. the ability to carry out rationally formulated projects.
That capacity for deliberative imagination was equally singled out as man's defining feature in De anima III.11. While seen by Aristotle as a universal human feature, the definition applied to wise and foolish alike, and did not in any way imply necessarily the making of rational choices, as opposed to the ability to make them.
Influence and legacy
The definition of man as a rational animal was common in scholastical philosophy. Catholic Encyclopedia states that this definition means that "in the system of classification and definition shown in the Arbor Porphyriana, man is a substance, corporeal, living, sentient, and rational".
Shall I say 'a rational animal'? No; for then I should have to inquire what an animal is, what rationality is, and in this one question would lead me down the slope to other harder ones.
Freud was as aware as any of the irrational forces at work in humankind, but he nevertheless resisted what he called too much “stress on the weakness of the ego in relation to the id and of our rational elements in the face of the daemonic forces within us”.
Language and symbols
Neo-kantian philosopher Ernst Cassirer, in his work An Essay on Man (1944), altered Aristotle definition to label man as a symbolic animal. This definition has been influential in the field of philosophical anthropology, where it has been reprised by Gilbert Durand, and has been echoed in the naturalist description of man as the compulsive communicator.
Sociologists in the tradition of Max Weber distinguish rational behavior (means-end oriented) from irrational, emotional or confused behavior, as well as from traditional-oriented behavior, but recognise the wide role of all the latter types in human life.
Ethnomethodology sees rational human behavior as representing perhaps 1/10th of the human condition, dependent on the 9/10ths of background assumptions which provide the frame for means-end decision making.
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- Man is a rational animal — so at least I have been told. Throughout a long life I have been looked diligently for evidence in favour of this statement, but so far I have not had the good fortune to come across it. — Bertrand Russell
- Aristotle, Ethics (1976) p. 75 and p. 88
- B. P. Stigum, Econometrics and the Philosophy of Economics (2003) p. 194
- Stigum, p. 198
- L.Johnson, Power Knowledge Animals (2012) p. 80
- One or more of the preceding sentences incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Man". Catholic Encyclopedia. Robert Appleton Company.
- The Philosophical Writings of Descartes Volume II. Translated by John Cottingham, Robert Stoothoff, Dugald Murdoch. Cambridge University Press. 1984.
- S. Freud, On Psychopathology (PFL 10) p. 247
- D. Attenborough, Life on Earth (1992) Ch 13
- Alfred Schutz, The Phenomenology of the Social World (1997) p. 240
- A. Giddens, Positivism and Sociology (1974) p. 72
- Bertrand Russell, The Basic Writings of Bertrand Russell (2009), p. 45