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Rh go into their details. Plato's moral philosophy will be best understood by being confronted with that of the Sophists, against which it was specially directed, just as his theory of ideas was designed to refute their theory of knowledge. If man be nothing but an aggregate of sensations, he can have no other end than sensational enjoyment, and no other principle of action than selfishness. Such, accordingly, was the general purport of the Sophistical morality, although some of its expounders recoiled from the extreme conclusions to which their principles led. Others, however, were less scrupulous. They explained the origin of justice in this curious fashion. The best condition, they said, in which a man can be placed is that in which he can injure others with impunity; the worst is that in which he can be injured without the power of defence or retaliation. But men cannot always assure themselves of the best condition, or guard against falling into the worst. This consideration leads them to a compromise, in which they consent to abandon the former condition in order to escape the latter, the evils of which outweigh the advantages of the other state. This compromise is itself justice, and such are the circumstances in which that virtue originates. From this it follows that the semblance of justice is better than the reality; because the semblance will prevent others from injuring us, while it will yet enable us to injure them to our heart's content.—(Republic, ii. pp. 358-9.)