Nowhere has this character of Greek ethics received more classical expression than in the Republic of Plato. In the prelude to his subject—which is the nature of Right and Morality—Plato has touched briefly on certain popular and inadequate views. There is the view that Right has its province in performance of certain single and external acts—in business honesty and commercial straightforwardness. There is the view that it is rendering to each what is due to him; that it consists in the proper reciprocity of services, in the balance of social give and take. There is the critical or hyper-critical view which, from seeing so much that is called justice to be in harmony with the interest of the predominant social order, bluntly identifies mere force or strength as the ground of right. And there are views which regard it as due to social conventions and artifices, to the influence of education, to political arrangements and the operation of irrational prejudices. To all these views Plato objects: not because they are false—for they are all in part, often in large part, true—but because they are inadequate and do not go to the root of the matter. The foundations of right lie, he says, not in external act, but in the inner man: not in convention, but in nature: not in relation to others, but in the constitution of the soul itself. That ethical idea—the idea of right—which seems most obviously to have its centre outside the individual, to live and grow only in the relations between individuals, Plato selects in order to show the independent royalty of the single human soul. The world, as Hume afterwards, called justice artificial: Plato will prove it natural. In a way he joins company with those who bid us drive out the spectre of duty, of obligation coming upon the soul from social authority, from traditional idea, from religious sanctions. He preaches—or he is about to preach—the autonomy of the will.