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The vision of another world is ascribed to Er, the son of Armenius, who is said by Clement of Alexandria to have been Zoroaster. The tale has certainly an oriental character, and may be compared with the pilgrimages of the soul in the Zend Avesta (Haug, Avesta). But no trace of acquaintance with Zoroaster is found elsewhere in Plato's writings, and there is no reason for giving him the name of Er the Pamphylian. The philosophy of Heracleitus cannot be shown to be borrowed from Zoroaster, and still less the myths of Plato.
The local arrangement of the vision is less distinct than that of the Phaedrus and Phaedo. Astronomy is mingled with symbolism and mythology; the great sphere of heaven is represented under the symbol of a cylinder or box, containing the seven orbits of the planets and the fixed stars; this is suspended from an axis or spindle which turns on the knees of Necessity; the revolutions of the seven orbits contained in the cylinder are guided by the fates, and their harmonious motion produces the music of the spheres. Through the innermost or eighth of these, which is the moon, is passed the spindle; but it is doubtful whether this is the continuation of the column of light, from which the pilgrims contemplate the heavens; the words of Plato imply that they are connected, but not the same. The column itself is clearly not of adamant. The spindle (which is of adamant) is fastened to the ends of the chains which extend to the middle of the column of light—this column is said to hold together the heaven; but whether it hangs from the spindle, or is at right angles to it, is not explained. The cylinder containing the orbits of the stars is almost as much a symbol as the figure of Necessity turning the spindle;—for the outermost rim is the sphere of the fixed stars, and nothing is said about the intervals of space which divide the paths of the stars in the heavens. The description is both a picture and an orrery, and therefore is necessarily inconsistent with itself. The column of light is not the Milky Way—which is neither straight, nor like a rainbow—but the imaginary axis of the earth. This is compared to the rainbow in respect not of form but of colour, and not to the undergirders of a trireme, but to the straight rope running from prow to stern in which the undergirders meet.
The orrery or picture of the heavens given in the Republic differs in its mode of representation from the circles of the same and of the other in the Timaeus. In both the fixed stars are distinguished from the planets, and they move in orbits without them, although in an opposite direction: in the Republic as in the Timaeus they are all moving round the axis of the world. But we are not certain that in the former they are moving round the earth. No distinct mention is made in the Republic of the circles of the same and other; although both in the Timaeus and in the Republic the motion of the fixed stars is supposed to coincide with the motion of the whole. The relative thickness of the rims is perhaps designed to express the relative distances of the planets. Plato probably intended to represent the earth, from which Er and his companions are viewing the heavens, as stationary in place; but whether or not herself revolving, unless this is implied in the revolution of the axis, is uncertain (Timaeus). The spectator may be supposed to look at the heavenly bodies, either from above or below. The earth is a sort of earth and heaven in one, like the heaven of the Phaedrus, on the back of which the spectator goes out to take a peep at the stars and is borne round in the revolution. There is no distinction between the equator and the ecliptic. But Plato is no doubt led to imagine that the planets have an opposite motion to that of the fixed stars, in order to account for their appearances in the heavens. In the description of the meadow, and the retribution of the good and evil after death, there are traces of Homer.
The description of the axis as a spindle, and of the heavenly bodies as forming a whole, partly arises out of the attempt to connect the motions of the heavenly bodies with the mythological image of the web, or weaving of the Fates. The giving of the lots, the weaving of them, and the making of them irreversible, which are ascribed to the three Fates—Lachesis, Clotho, Atropos, are obviously derived from their names. The element of chance in human life is indicated by the order of the lots. But chance, however adverse, may be overcome by the wisdom of man, if he knows how to choose aright; there is a worse enemy to man than chance; this enemy is himself. He who was moderately fortunate in the number of the lot—even the very last comer—might have a good life if he chose with wisdom. And as Plato does not like to make an assertion which is unproven, he more than confirms this statement a few sentences afterwards by the example of Odysseus, who chose last. But the virtue which is founded on habit is not sufficient to enable a man to choose; he must add to virtue knowledge, if he is to act rightly when placed in new circumstances. The routine of good actions and good habits is an inferior sort of goodness; and, as Coleridge says, 'Common sense is intolerable which is not based on metaphysics,' so Plato would have said, 'Habit is worthless which is not based upon philosophy.'
The freedom of the will to refuse the evil and to choose the good is distinctly asserted. 'Virtue is free, and as a man honours or dishonours her he will have more or less of her.' The life of man is 'rounded' by necessity; there are circumstances prior to birth which affect him (Pol.). But within the walls of necessity there is an open space in which he is his own master, and can study for himself the effects which the variously compounded gifts of nature or fortune have upon the soul, and act accordingly. All men cannot have the first choice in everything. But the lot of all men is good enough, if they choose wisely and will live diligently.
The verisimilitude which is given to the pilgrimage of a thousand years, by the intimation that Ardiaeus had lived a thousand years before; the coincidence of Er coming to life on the twelfth day after he was supposed to have been dead with the seven days which the pilgrims passed in the meadow, and the four days during which they journeyed to the column of light; the precision with which the soul is mentioned who chose the twentieth lot; the passing remarks that there was no definite character among the souls, and that the souls which had chosen ill blamed any one rather than themselves; or that some of the souls drank more than was necessary of the waters of Forgetfulness, while Er himself was hindered from drinking; the desire of Odysseus to rest at last, unlike the conception of him in Dante and Tennyson; the feigned ignorance of how Er returned to the body, when the other souls went shooting like stars to their birth,—add greatly to the probability of the narrative. They are such touches of nature as the art of Defoe might have introduced when he wished to win credibility for marvels and apparitions.
There still remain to be considered some points which have been intentionally reserved to the end: (1) the Janus-like character of the Republic, which presents two faces—one an Hellenic state, the other a kingdom of philosophers. Connected with the latter of the two aspects are (2) the paradoxes of the Republic, as they have been termed by Morgenstern: (a) the community of property; (b) of families; (c) the rule of philosophers; (d) the analogy of the individual and the State, which, like some other analogies in the Republic, is carried too far. We may then proceed to consider (3) the subject of education as conceived by Plato, bringing together in a general view the education of youth and the education of after-life; (4) we may note further some essential differences between ancient and modern politics which are suggested by the Republic; (5) we may compare the Politicus and the Laws; (6) we may observe the influence exercised by Plato on his imitators; and (7) take occasion to consider the nature and value of political, and (8) of religious ideals.
