Who is man?
We have reasoning power, but as Hamlet pensively muses, “reason fusts in us [almost] unused.”
Imbedded in the titular definition is Aristotle’s definition of man, “man is an animal possessing reason,” and that is a pretty good distinction between man and most if not all other animals.
Consequences: man is an emotionally unbalanced animal with palpable intellectual confusions, who firmly believes his illogic is logical thinking.
Man is the opposite of Plato’s ideal man of reason, most closely approximated by Plato’s idealized portrait of Socrates.