For himself, Plutarch adopts the Platonic division of the soul into the rational, spirited, and Concupiscent elements, with some Aristotelian modifications.
"Roman Society from Nero to Marcus Aurelius"
Samuel Dill
Some American's Concupiscent eye had alighted on her, observed her beauty, and marked her down.
"Christopher and Columbus"
Countess Elizabeth Von Arnim
But a further question arises: Is passion different from reason also, or only a kind of reason; in which latter case, instead of three principles in the soul, there will only be two, the rational and the Concupiscent; or rather, as the State was composed of three classes, traders, auxiliaries, counsellors, so may there not be in the individual soul a third element which is passion or spirit, and when not corrupted by bad education is the natural auxiliary of reason Yes, he said, there must be a third.
"Plato's Republic"
Plato