ONE:The great religious movement of the sixth and fifth centuries��chiefly represented for us by the names of Pythagoras, Aeschylus, and Pindar��would in all probability have entirely won over the educated classes, and given definiteness to the half-articulate utterances of popular tradition, had it not been arrested prematurely by the development of physical236 speculation. We showed in the first chapter that Greek philosophy in its earliest stages was entirely materialistic. It differed, indeed, from modern materialism in holding that the soul, or seat of conscious life, is an entity distinct from the body; but the distinction was one between a grosser and a finer matter, or else between a simpler and a more complex arrangement of the same matter, not between an extended and an indivisible substance. Whatever theories, then, were entertained with respect to the one would inevitably come to be entertained also with respect to the other. Now, with the exception of the Eleates, who denied the reality of change and separation altogether, every school agreed in teaching that all particular bodies are formed either by differentiation or by decomposition and recomposition out of the same primordial elements. From this it followed, as a natural consequence, that, although the whole mass of matter was eternal, each particular aggregate of matter must perish in order to release the elements required for the formation of new aggregates. It is obvious that, assuming the soul to be material, its immortality was irreconcilable with such a doctrine as this. A combination of four elements and two conflicting forces, such as Empedocles supposed the human mind to be, could not possibly outlast the organism in which it was enclosed; and if Empedocles himself, by an inconsistency not uncommon with men of genius, refused to draw the only legitimate conclusion from his own principles, the discrepancy could not fail to force itself on his successors. Still more fatal to the belief in a continuance of personal identity after death was the theory put forward by Diogenes of Apollonia, that there is really no personal identity even in life��that consciousness is only maintained by a perpetual inhalation of the vital air in which all reason resides. The soul very literally left the body with the last breath, and had a poor chance of holding together afterwards, especially, as the wits observed, if a high wind happened to be blowing at the time.So far, however, we only stand on the threshold of Platonic love. The earthly passion, being itself a kind of generalisation, is our first step in the ascent to that highest stage of existence where wisdom and virtue and happiness are one��the good to which all other goods are related as means to an end. But love is not only an introduction to philosophy, it is a type of philosophy itself. Both are conditions intermediate between vacuity and fulfilment; desire being by its very nature dis218satisfied, and vanishing at the instant that its object is attained. The philosopher is a lover of wisdom, and therefore not wise; and yet not wholly ignorant, for he knows that he knows nothing. Thus we seem to be thrown back on the standpoint of Plato��s earliest agnosticism. Nevertheless, if the Symposium agrees nominally with the Apologia, in reality it marks a much more advanced point of speculation. The idea of what knowledge is has begun to assume a much clearer expression. We gather from various hints and suggestions that it is the perception of likeness; the very process of ascending generalisation typified by intellectual love.