Socrates. Can we then, if it is ever passing out below, predicate about it; first, that it is that; next, that it has this or that quality; or must it not be that, even as we speak, it should straightway become some other thing, and go out under on its way, and be no longer as it is? Now, how could that which is never in the same state be a thing at all? . . .

[17] Socrates. Nor, in truth, could it be an object of knowledge to any one; for, even as he who shall know comes upon it, it would become another thing with other qualities; so that it would be no longer matter of knowledge what sort of a thing it is, or in what condition. Now, no form of knowing, methinks, has knowledge of that which it knows to be no-how.

Cratylus. It is as you say.

Socrates. But if, Cratylus, all things change sides, and nothing stays, it is not fitting to say that there is any knowing at all. . . . And the consequence of this argument would be, that there is neither any one to know, nor anything to be known. If, on the other hand, there be always that which knows, and that which is known; and if the Beautiful is, and the Good is, and each one of those things that really are, is, then, to my thinking, those things in no way resemble that moving stream of which we are now speaking. Whether, then, these matters be thus, or in that other way as the followers of Heraclitus affirm and many besides, I fear may be no easy thing to search out. But certainly it is not like a sensible man, committing one's self, and one's own soul, to the rule of names, to serve them, and, with faith in names and those who imposed them, as if one knew something thereby, to maintain (damaging thus the character of that which is, and our own) that there is no sound ring in any one of them, but that all, like earthen pots, let water. Cratylus, 439.+

Yet from certain fragments in which the Logos is already named we may understand that there had been another side to the doctrine of Heraclitus; an attempt on his part, after all, to reduce that world of chaotic mutation to cosmos, to the unity of a reasonable order, by the search for and the notation, if there be such, of an antiphonal rhythm, or logic, which, proceeding uniformly from movement to movement, as in some intricate musical theme, might link together in one those contending, infinitely diverse [18] impulses. It was an act of recognition, even on the part of a philosophy of the inconsecutive, the incoherent, the insane, of that Wisdom which, "reacheth from end to end, sweetly and strongly ordering all things." But if the "weeping philosopher," the first of the pessimists, finds the ground of his melancholy in the sense of universal change, still more must he weep at the dulness of men's ears to that continuous strain of melody throughout it. In truth, what was sympathetic with the hour and the scene in the Heraclitean doctrine, was the boldly aggressive, the paradoxical and negative tendency there, in natural collusion, as it was, with the destructiveness of undisciplined youth; that sense of rapid dissolution, which, according to one's temperament and one's luck in things, might extinguish, or kindle all the more eagerly, an interest in the mere phenomena of existence, of one's so hasty passage through the world.

The theory of the perpetual flux was indeed an apprehension of which the full scope was only to be realised by a later age, in alliance with a larger knowledge of the natural world, a closer observation of the phenomena of mind, than was possible, even for Heraclitus, at that early day. So, the seeds of almost all scientific ideas might seem to have been dimly enfolded in the mind of antiquity; but fecundated, admitted to their full working prerogative, one by one, in after ages, by good favour of the special [19] intellectual conditions belonging to a particular generation, which, on a sudden, finds itself preoccupied by a formula, not so much new, as renovated by new application.

It is in this way that the most modern metaphysical, and the most modern empirical philosophies alike have illustrated emphatically, justified, expanded, the divination (so we may make bold to call it under the new light now thrown upon it) of the ancient theorist of Ephesus. The entire modern theory of "development," in all its various phases, proved or unprovable,—what is it but old Heracliteanism awake once more in a new world, and grown to full proportions?

Panta chôrei, panta rhei+—It is the burden of Hegel on the one hand, to whom nature, and art, and polity, and philosophy, aye, and religion too, each in its long historic series, are but so many conscious movements in the secular process of the eternal mind; and on the other hand of Darwin and Darwinism, for which "type" itself properly is not but is only always becoming. The bold paradox of Heraclitus is, in effect, repeated on all sides, as the vital persuasion just now of a cautiously reasoned experience, and, in illustration of the very law of change which it asserts, may itself presently be superseded as a commonplace. Think of all that subtly disguised movement, latens processus, Bacon calls it (again as if by a kind of anticipation) which [20] modern research has detected, measured, hopes to reduce to minuter or ally to still larger currents, in what had seemed most substantial to the naked eye, the inattentive mind. To the "observation and experiment" of the physical enquirer of to-day, the eye and the sun it lives by reveal themselves, after all, as Heraclitus had declared (scarcely serious, he seemed to those around him) as literally in constant extinction and renewal; the sun only going out more gradually than the human eye; the system meanwhile, of which it is the centre, in ceaseless movement nowhither. Our terrestrial planet is in constant increase by meteoric dust, moving to it through endless time out of infinite space. The Alps drift down the rivers into the plains, as still loftier mountains found their level there ages ago. The granite kernel of the earth, it is said, is ever changing in its very substance, its molecular constitution, by the passage through it of electric currents. And the Darwinian theory—that "species," the identifying forms of animal and vegetable life, immutable though they seem now, as of old in the Garden of Eden, are fashioned by slow development, while perhaps millions of years go by: well! every month is adding to its evidence. Nay, the idea of development (that, too, a thing of growth, developed in the progress of reflexion) is at last invading one by one, as the secret of their explanation, all the products of mind, the very [21] mind itself, the abstract reason; our certainty, for instance, that two and two make four. Gradually we have come to think, or to feel, that primary certitude. Political constitutions, again, as we now see so clearly, are "not made," cannot be made, but "grow." Races, laws, arts, have their origins and end, are themselves ripples only on the great river of organic life; and language is changing on our very lips.

In Plato's day, the Heraclitean flux, so deep down in nature itself— the flood, the fire—seemed to have laid hold on man, on the social and moral world, dissolving or disintegrating opinion, first principles, faith, establishing amorphism, so to call it, there also. All along indeed the genius, the good gifts of Greece to the world had had much to do with the mobility of its temperament. Only, when Plato came into potent contact with his countrymen (Pericles, Phidias, Socrates being now gone) in politics, in literature and art, in men's characters, the defect naturally incident to that fine quality had come to have unchecked sway. From the lifeless background of an unprogressive world—Egypt, Syria, frozen Scythia—a world in which the unconscious social aggregate had been everything, the conscious individual, his capacity and rights, almost nothing, the Greek had stepped forth, like the young prince in the fable, to set things going. To the philosophic eye however, [22] about the time when the history of Thucydides leaves off, they might seem to need a regulator, ere the very wheels wore themselves out.

Mobility! We do not think that a necessarily undesirable condition of life, of mind, of the physical world about us. 'Tis the dead things, we may remind ourselves, that after all are most entirely at rest, and might reasonably hold that motion (vicious, fallacious, infectious motion, as Plato inclines to think) covers all that is best worth being. And as for philosophy—mobility, versatility, the habit of thought that can most adequately follow the subtle movement of things, that, surely, were the secret of wisdom, of the true knowledge of them. It means susceptibility, sympathetic intelligence, capacity, in short. It was the spirit of God that moved, moves still, in every form of real power, everywhere. Yet to Plato motion becomes the token of unreality in things, of falsity in our thoughts about them. It is just this principle of mobility, in itself so welcome to all of us, that, with all his contriving care for the future, he desires to withstand. Everywhere he displays himself as an advocate of the immutable. The Republic is a proposal to establish it indefectibly in a very precisely regulated, a very exclusive community, which shall be a refuge for elect souls from an ill-made world.