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. That four powerful influences made for the political unity of Greece was pointed out by [23] Grote: common blood, common language, a common religious centre, the great games in which all alike communicated. He adds that they failed to make the Greeks one people. Panhellenism was realised for the first time, and then but imperfectly, by Alexander the Great. The centrifugal tendency had ever been too much for the centripetal tendency in them, the progressive elements for the element of order. Their boundless impatience, that passion for novelty noted in them by Saint Paul, had been a matter of radical character. Their varied natural gifts did but concentrate themselves now and then to an effective centre, that they might be dissipated again, towards every side, in daring adventure alike of action and of thought. Variety and novelty of experience, further quickened by a consciousness trained to an equally nimble power of movement, individualism, the capacities, the claim, of the individual, forced into their utmost play by a ready sense and dexterous appliance of opportunity,--herein, certainly, lay at least one half of their vocation in history. The material conformation of Greece, a land of islands and peninsulas, with a range of sea-coast immense as compared with its area, and broken up by repellent lines of mountain this way and that, nursing jealously a little township of three or four thousand souls into an independent type of its own, conspired to the same effect. Independence, local and personal,--it was the Greek ideal!