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He touches upon another question of great interest—the consciousness of evil—what in the Jewish Scriptures is called 'eating of the tree of the knowledge of good and evil.' At the end of the narrative, the Eleatic asks his companion whether this life of innocence, or that which men live at present, is the better of the two. He wants to distinguish between the mere animal life of innocence, the 'city of pigs,' as it is comically termed by Glaucon in the Republic, and the higher life of reason and philosophy. But as no one can determine the state of man in the world before the Fall, 'the question must remain unanswered.' Similar questions have occupied the minds of theologians in later ages; but they can hardly be said to have found an answer. Professor Campbell well observes, that the general spirit of the myth may be summed up in the words of the Lysis: 'If evil were to perish, should we hunger any more, or thirst any more, or have any similar sensations? Yet perhaps the question what will or will not be is a foolish one, for who can tell?' As in the Theaetetus, evil is supposed to continue,—here, as the consequence of a former state of the world, a sort of mephitic vapour exhaling from some ancient chaos,—there, as involved in the possibility of good, and incident to the mixed state of man.

Once more—and this is the point of connexion with the rest of the dialogue—the myth is intended to bring out the difference between the ideal and the actual state of man. In all ages of the world men have dreamed of a state of perfection, which has been, and is to be, but never is, and seems to disappear under the necessary conditions of human society. The uselessness, the danger, the true value of such political ideals have often been discussed; youth is too ready to believe in them; age to disparage them. Plato's 'prudens quaestio' respecting the comparative happiness of men in this and in a former cycle of existence is intended to elicit this contrast between the golden age and 'the life under Zeus' which is our own. To confuse the divine and human, or hastily apply one to the other, is a 'tremendous error.' Of the ideal or divine government of the world we can form no true or adequate conception; and this our mixed state of life, in which we are partly left to ourselves, but not wholly deserted by the gods, may contain some higher elements of good and knowledge than could have existed in the days of innocence under the rule of Cronos. So we may venture slightly to enlarge a Platonic thought which admits of a further application to Christian theology. Here are suggested also the distinctions between God causing and permitting evil, and between his more and less immediate government of the world.

II. The dialectical interest of the Statesman seems to contend in Plato's mind with the political; the dialogue might have been designated by two equally descriptive titles—either the 'Statesman,' or 'Concerning Method.' Dialectic, which in the earlier writings of Plato is a revival of the Socratic question and answer applied to definition, is now occupied with classification; there is nothing in which he takes greater delight than in processes of division (compare Phaedr.); he pursues them to a length out of proportion to his main subject, and appears to value them as a dialectical exercise, and for their own sake. A poetical vision of some order or hierarchy of ideas or sciences has already been floating before us in the Symposium and the Republic. And in the Phaedrus this aspect of dialectic is further sketched out, and the art of rhetoric is based on the division of the characters of mankind into their several classes. The same love of divisions is apparent in the Gorgias. But in a well-known passage of the Philebus occurs the first criticism on the nature of classification. There we are exhorted not to fall into the common error of passing from unity to infinity, but to find the intermediate classes; and we are reminded that in any process of generalization, there may be more than one class to which individuals may be referred, and that we must carry on the process of division until we have arrived at the infima species.

These precepts are not forgotten, either in the Sophist or in the Statesman. The Sophist contains four examples of division, carried on by regular steps, until in four different lines of descent we detect the Sophist. In the Statesman the king or statesman is discovered by a similar process; and we have a summary, probably made for the first time, of possessions appropriated by the labour of man, which are distributed into seven classes. We are warned against preferring the shorter to the longer method;—if we divide in the middle, we are most likely to light upon species; at the same time, the important remark is made, that 'a part is not to be confounded with a class.' Having discovered the genus under which the king falls, we proceed to distinguish him from the collateral species. To assist our imagination in making this separation, we require an example. The higher ideas, of which we have a dreamy knowledge, can only be represented by images taken from the external world. But, first of all, the nature of example is explained by an example. The child is taught to read by comparing the letters in words which he knows with the same letters in unknown combinations; and this is the sort of process which we are about to attempt. As a parallel to the king we select the worker in wool, and compare the art of weaving with the royal science, trying to separate either of them from the inferior classes to which they are akin. This has the incidental advantage, that weaving and the web furnish us with a figure of speech, which we can afterwards transfer to the State.

There are two uses of examples or images—in the first place, they suggest thoughts—secondly, they give them a distinct form. In the infancy of philosophy, as in childhood, the language of pictures is natural to man: truth in the abstract is hardly won, and only by use familiarized to the mind. Examples are akin to analogies, and have a reflex influence on thought; they people the vacant mind, and may often originate new directions of enquiry. Plato seems to be conscious of the suggestiveness of imagery; the general analogy of the arts is constantly employed by him as well as the comparison of particular arts—weaving, the refining of gold, the learning to read, music, statuary, painting, medicine, the art of the pilot—all of which occur in this dialogue alone: though he is also aware that 'comparisons are slippery things,' and may often give a false clearness to ideas. We shall find, in the Philebus, a division of sciences into practical and speculative, and into more or less speculative: here we have the idea of master-arts, or sciences which control inferior ones. Besides the supreme science of dialectic, 'which will forget us, if we forget her,' another master-science for the first time appears in view—the science of government, which fixes the limits of all the rest. This conception of the political or royal science as, from another point of view, the science of sciences, which holds sway over the rest, is not originally found in Aristotle, but in Plato.