Let us therefore hold, for the purpose of the present work, that the soul consists of two parts, the intellect and the will (Book II. chap. ii. sec. 2, 12)-the office of the intellect being to distinguish between objects, according as they seem deserving of being approved or disapproved; and the office of the will, to choose and follow what the intellect declares to be good, to reject and shun what it declares to be bad (Plato in Phaedro).

