=The Social as Law of Nature.=--The social nature of man, thus vindicated by Plato and Aristotle, remained as the permanent possession of Greek thought. Even the Epicureans, who developed further the hedonistic theory of life, emphasized the values of friendship as among the choicest and most refined sources of pleasure. The Stoics, who in their independence of wants took up the tradition of the Cynics, were yet far from interpreting this as an independence of society. The disintegration of the Greek states made it impossible to find the social body in the old city-state, and so we find with the Stoics a certain cosmopolitanism. It is the highest glory of man to be a citizen not of Athens but of the universe,--not of the city of Cecrops, but of the city of Zeus. And through this conception the social nature of man was made the basis of a "natural law," which found its expression in the principles of Roman and modern jurisprudence. =Passion or Reason.=--In answering the question as to the true nature of man, Plato and Aristotle found the suggestions likewise for the problem of individual good. For if the soldier as the seeker for fame and honor, the avaricious man embodying the desire for wealth, and still more, the tyrant personifying the unbridled expression of every lust and passion, are abhorrent, is it not easy to see that an orderly and harmonious development of impulses under the guidance and control of reason, is far better than that uncramped expression of desires and cravings for which some of the radical individualists and sensualists of the day were clamoring? As representative of this class, hear Callicles: "I plainly assert that he who would truly live ought to allow his desires to wax to the uttermost, and not to chastise them; but when they have grown to their greatest, he should have courage and intelligence to minister to them and to satisfy all his longings. And this I affirm to be natural justice and nobility." The temperate man is a fool. It is only in hungering and eating, in thirsting and drinking, in having all his desires about him, and gratifying every possible desire, that man lives happily.[75] But even Callicles himself admits that there are certain men, the creatures of degraded desire, whose lives are not ideal, and hence that there must be some choice of pleasure. And carrying out in the individual life the thought above suggested by the State, Plato raises the question as to whether man, a complex being, with both noble and ignoble impulses, and with the capacity of controlling reason, can be said to make a wise choice if he lets the passions run riot and choke out wholly his rational nature: