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We hardly appreciate the power which the idea of the State, like all other abstract ideas, exercised over the mind of Plato. To us the State seems to be built up out of the family, or sometimes to be the framework in which family and social life is contained. But to Plato in his present mood of mind the family is only a disturbing influence which, instead of filling up, tends to disarrange the higher unity of the State. No organization is needed except a political, which, regarded from another point of view, is a military one. The State is all-sufficing for the wants of man, and, like the idea of the Church in later ages, absorbs all other desires and affections. In time of war the thousand citizens are to stand like a rampart impregnable against the world or the Persian host; in time of peace the preparation for war and their duties to the State, which are also their duties to one another, take up their whole life and time. The only other interest which is allowed to them besides that of war, is the interest of philosophy. When they are too old to be soldiers they are to retire from active life and to have a second novitiate of study and contemplation. There is an element of monasticism even in Plato's communism. If he could have done without children, he might have converted his Republic into a religious order. Neither in the Laws, when the daylight of common sense breaks in upon him, does he retract his error. In the state of which he would be the founder, there is no marrying or giving in marriage: but because of the infirmity of mankind, he condescends to allow the law of nature to prevail.

(c) But Plato has an equal, or, in his own estimation, even greater paradox in reserve, which is summed up in the famous text, 'Until kings are philosophers or philosophers are kings, cities will never cease from ill.' And by philosophers he explains himself to mean those who are capable of apprehending ideas, especially the idea of good. To the attainment of this higher knowledge the second education is directed. Through a process of training which has already made them good citizens they are now to be made good legislators. We find with some surprise (not unlike the feeling which Aristotle in a well-known passage describes the hearers of Plato's lectures as experiencing, when they went to a discourse on the idea of good, expecting to be instructed in moral truths, and received instead of them arithmetical and mathematical formulae) that Plato does not propose for his future legislators any study of finance or law or military tactics, but only of abstract mathematics, as a preparation for the still more abstract conception of good. We ask, with Aristotle, What is the use of a man knowing the idea of good, if he does not know what is good for this individual, this state, this condition of society? We cannot understand how Plato's legislators or guardians are to be fitted for their work of statesmen by the study of the five mathematical sciences. We vainly search in Plato's own writings for any explanation of this seeming absurdity.

The discovery of a great metaphysical conception seems to ravish the mind with a prophetic consciousness which takes away the power of estimating its value. No metaphysical enquirer has ever fairly criticised his own speculations; in his own judgment they have been above criticism; nor has he understood that what to him seemed to be absolute truth may reappear in the next generation as a form of logic or an instrument of thought. And posterity have also sometimes equally misapprehended the real value of his speculations. They appear to them to have contributed nothing to the stock of human knowledge. The IDEA of good is apt to be regarded by the modern thinker as an unmeaning abstraction; but he forgets that this abstraction is waiting ready for use, and will hereafter be filled up by the divisions of knowledge. When mankind do not as yet know that the world is subject to law, the introduction of the mere conception of law or design or final cause, and the far-off anticipation of the harmony of knowledge, are great steps onward. Even the crude generalization of the unity of all things leads men to view the world with different eyes, and may easily affect their conception of human life and of politics, and also their own conduct and character (Tim). We can imagine how a great mind like that of Pericles might derive elevation from his intercourse with Anaxagoras (Phaedr.). To be struggling towards a higher but unattainable conception is a more favourable intellectual condition than to rest satisfied in a narrow portion of ascertained fact. And the earlier, which have sometimes been the greater ideas of science, are often lost sight of at a later period. How rarely can we say of any modern enquirer in the magnificent language of Plato, that 'He is the spectator of all time and of all existence!'

Nor is there anything unnatural in the hasty application of these vast metaphysical conceptions to practical and political life. In the first enthusiasm of ideas men are apt to see them everywhere, and to apply them in the most remote sphere. They do not understand that the experience of ages is required to enable them to fill up 'the intermediate axioms.' Plato himself seems to have imagined that the truths of psychology, like those of astronomy and harmonics, would be arrived at by a process of deduction, and that the method which he has pursued in the Fourth Book, of inferring them from experience and the use of language, was imperfect and only provisional. But when, after having arrived at the idea of good, which is the end of the science of dialectic, he is asked, What is the nature, and what are the divisions of the science? He refuses to answer, as if intending by the refusal to intimate that the state of knowledge which then existed was not such as would allow the philosopher to enter into his final rest. The previous sciences must first be studied, and will, we may add, continue to be studied tell the end of time, although in a sense different from any which Plato could have conceived. But we may observe, that while he is aware of the vacancy of his own ideal, he is full of enthusiasm in the contemplation of it. Looking into the orb of light, he sees nothing, but he is warmed and elevated. The Hebrew prophet believed that faith in God would enable him to govern the world; the Greek philosopher imagined that contemplation of the good would make a legislator. There is as much to be filled up in the one case as in the other, and the one mode of conception is to the Israelite what the other is to the Greek. Both find a repose in a divine perfection, which, whether in a more personal or impersonal form, exists without them and independently of them, as well as within them.

There is no mention of the idea of good in the Timaeus, nor of the divine Creator of the world in the Republic; and we are naturally led to ask in what relation they stand to one another. Is God above or below the idea of good? Or is the Idea of Good another mode of conceiving God? The latter appears to be the truer answer. To the Greek philosopher the perfection and unity of God was a far higher conception than his personality, which he hardly found a word to express, and which to him would have seemed to be borrowed from mythology. To the Christian, on the other hand, or to the modern thinker in general, it is difficult, if not impossible, to attach reality to what he terms mere abstraction; while to Plato this very abstraction is the truest and most real of all things. Hence, from a difference in forms of thought, Plato appears to be resting on a creation of his own mind only. But if we may be allowed to paraphrase the idea of good by the words 'intelligent principle of law and order in the universe, embracing equally man and nature,' we begin to find a meeting-point between him and ourselves.