And here, significantly enough, we find we are brought back in our modern way to something very like Plato's own conception of an eternal unchanging Reality. There are endless problems in the whole conception of the Eternal that I am quite unable even to attempt; but this much at least seems clear to me, that the whole idea of mankind learning by the experience of History, implies something of permanent value running through that experience. The very thought of continued progress implies that man can look back at the successive stages of the Past and say of each: In that lay values which I, to-day and always, can recognize as good, although I believe we have more good now. Seeley speaks in a noble passage of how religion might conceive a progressive revelation which was, in a sense, the same through all its stages, and yet was a growing thing:--'each new revelation asserts its own superiority to those which went before,' but the superiority is 'not of one thing to another thing--but of the developed thing to the undeveloped'. 'It is thus', he writes, 'that the ages should behave to one another.' This is the true 'understanding and concert with time'.[10] And though Plato does not live in the thought of historic progress, yet such a conception of progress which recognizes at different stages different expressions, more or less adequate, of one eternal value, such a way of thinking is entirely Platonic. When we look back at history in this mood we think not only of grasping the right principles for the Future, but of rejoicing in the definite achievements of the Past, and we feel this most poignantly, I think, of the achievements won by the spirit of Beauty. Great works of Art we are accustomed actually to call immortal, and we mean by this not merely that we think they will always be famous, but that there is something in them that makes it impossible for them ever to be superseded. In themselves they are inexhaustible: if they cease to interest us, it is our fault and not theirs. We may want more, we do want more, where they came from, but we never want to lose them, any more than we could bear to lose our old friends, though we may desire to make new ones. Of all the divine Ideas, said Plato, Beauty is the one that shows itself most plainly in the world of sense and speaks to us most plainly of the eternal realities. This, however, is perhaps trenching on the subject of Progress in Art, and I should like to return to the general Greek conception of the tendency in all nature towards the Good, the perfect realization of perfect types.