"According to the Philosopher (Ethic. ix, 8), a thing seems to be chiefly what is principle in it; thus what the governor of a state does, the state is said to do. In this way sometimes what is principle in man is said to be man; sometimes, indeed, the intellectual part which, in accordance with truth, is called the 'inward' man."
— St. Thomas Aquinas (1225-1274)
(I, Q75, A4, Rp 1)