The human soul he conceived to be a mixture of two elements. In virtue of its higher spiritual nature it participates in the world of ideas, the life of God: and in virtue of its lower or animal impulses, in the corporeal world of decay. These two dissimilar parts are connected by an intermediate element called by Plato _thymos_ or courage, implying the emotions or affections of the heart. Hence a threefold constitution of the soul is conceived--the rational powers, the emotional desires, and the animal passions. If we ask who is the good man? Plato answers, it is the man in whom these three elements are harmonised. On the basis of this psychology Plato classifies and determines the virtues--adopting the four cardinal virtues of Greek tradition as the fundamental types of morality. Wisdom is the quality, or condition of all virtue and the crown of the moral life: courage is the virtue of the emotional part of man; temperance or moderation, the virtue of the lower appetites: while justice is the unity and the principle of the others. Virtue is thus no longer identified with knowledge simply. Another source of vice besides ignorance is assumed, viz., the disorder and conflict of the soul; and the well-being of man lies in the attainment of a well-ordered and harmonious life. As health is the harmony of the body, so virtue is the harmony of the soul--a condition of perfection in which every desire is kept in control and every function performs its part with a view to the good of the whole. Morality, however, does not belong merely to the individual, but has its perfect realisation in the state in which the three elements of the soul have their {39} counterpart in the threefold rank of society. Man is indeed but a type of a larger cosmos, and it is not as an individual but as a citizen that he finds his station and duties, and is capable of realising his true life. Thus we see how Plato is led to correct the shortcomings of Socrates--his abrupt distinction between ignorance and knowledge, his vagueness as to the meaning of the good, and his tendency to emphasise the subjective side of virtue and withdraw the individual from the community of which he is essentially a part. But in developing his theory of ideas Plato has represented the true life of man as consisting in the knowledge of, and indeed in absorption in, God, a state to which man can only attain by the suppression of his natural impulses and withdrawal from earthly life: and though there is not wanting in Plato's later teaching the higher conception of the transformation of the animal passions, he is not wholly successful in overcoming the dualism between impulse and reason which besets some of the earlier dialogues.