Thus, in place of a series of hard and fast rules, a rigid and uncompromising distinction of acts and affections into good and bad, the former to be absolutely chosen and the latter absolutely eschewed, Aristotle presents us with the general type of a subtle and shifting problem, the solution of which must be worked out afresh by each individual in each particular case. Conduct to him is a free and living creature, and not a machine controlled by fixed laws. Every life is a work of art shaped by the man who lives it; according to the faculty of the artist will be the quality of his work, and no general rules can supply the place of his own direct perception at every turn. The Good is the right proportion, the right manner and occasion; the Bad is all that varies from this "right." But the elements of human nature in themselves are neither good nor bad; they are merely the raw material out of which the one or the other may be shaped. The idea thus formulated by Aristotle is typically Greek. In another form it is the basis of the ethical philosophy of Plato, who habitually regards virtue as a kind of "order." "The virtue of each thing," he says, "whether body or soul, instrument or creature, when given to them in the best way comes to them not by chance but as the result of the order and truth and art which are imparted to them." [Footnote: Plato, Gorgias, 506 d.--Translated by Jowett] And the conception here indicated, is worked out in detail in his Republic. There, after distinguishing in the soul three principles or powers, reason, passion, and desire, he defines justice as the maintenance among them of their proper mutual relation, each moving in its own place and doing its appropriate work as is, or should be, the case with the different classes in a state. "The just man will not permit the several principles within him to do any work but their own, nor allow the distinct classes in his soul to interfere with each other, but will really set his house in order; and having gained the mastery over himself, will so regulate his own character as to be on good terms with himself, and to set those three principles in tune together, as if they were verily three chords of a harmony, a higher and a lower and a middle, and whatever may lie between these; and after he has bound all these together, and reduced the many elements of his nature to a real unity, as a temperate and duly harmonized man, he will then at length proceed to do whatever he may have to do." [Footnote: Plato, Rep. IV. 443.--Translation by Davies and Vaughan.]