t the several
principles, whether in the state or in the individual, do their own
business? And justice is the quality which makes just men and just
states. Moreover, our old division of labour, which required that there
should be one man for one use, was a dream or anticipation of what was
to follow; and that dream has now been realized in justice, which
begins by binding together the three chords of the soul, and then acts
harmoniously in every relation of life. And injustice, which is the
insubordination and disobedience of the inferior elements in the soul,
is the opposite of justice, and is inharmonious and unnatural, being to
the soul what disease is to the body; for in the soul as well as in the
body, good or bad actions produce good or bad habits. And virtue is the
health and beauty and well-being of the soul, and vice is the disease
and weakness and deformity of the soul.

Again the old question returns upon us: Is justice or injustice the
more profitable? The question has become ridiculous. For injustice, like
mortal disease, makes life not worth having. Come up with me to the hill
which overhangs the city and look down upon the single form of virtue,
and the infinite forms of vice, among which are four special ones,
characteristic both of states and of individuals. And the state which
corresponds to the single form of virtue is that which we have been
describing, wherein reason rules under one of two names--monarchy and
aristocracy. Thus there are five forms in all, both of states and of
souls...

In attempting to prove that the soul has three separate faculties, Plato
takes occasion to discuss what makes difference of faculties. And
the criterion which he proposes is difference in the working of the
faculties. The same faculty cannot produce contradictory effects. But
the path of early reasoners is beset by thorny entanglements, and he
will not proceed a step without first clearing the ground. This leads
him into a tiresome digression, which is intended to explain the nature
of contradiction. First, the contradiction must be at the same time and
in the same relation. Secondly, no extraneous word must be introduced
into either of the terms in which the contradictory proposition is
expressed: for example, thirst is of drink, not of warm drink. He
implies, what he does not say, that if, by the advice of reason, or by
the impulse of anger, a man is restrained from drinking, this proves
that thirst, or desire u