At the centre of it lies what has crystallised in more living shape out of the dry conceptions of the Socratic method—the domain of ideas. Even as Parmenides perceived Being in the eternal All-Existent, accessible to Reason alone, so Plato sees the being of individual things in that which pertains to them in common and as such can be grasped by the Reason. But even as the Eleatic “One” exists even apart from its recognition as an objective being, so these eternal and unchangeable archetypes (
To Socrates the idea of Good and of Virtue lay at the heart of his teaching, and thus the preponderance of the idea of Good is confirmed to his pupil, and in its theological elaboration this abstract idea is converted into the Supreme Reason, the first cause of Being, which is identical with the Deity.
As to the Eleatics, the external world was an illusion of the senses, and in any case a thing irrational, so matter and the world of phenomena which occupies the middle place between matter and ideas is hard to grasp, and Plato’s notion of the World-Soul which hovers between the two is as contradictory and obscure as that of the human soul. For with this gifted poet-philosopher there is much that tarries on the threshold of consciousness, and fails to struggle into clear light, a circumstance that harmonises with his own teachings, which find clearness and singleness of purport in the Eternal and Divine alone, obscurity and ambiguity in the intermediate terrestrial sphere of genesis, and utter darkness and inconceivability in the lower sphere of matter and non-existence. These three stages are repeated in his theory of the soul, which from desire rises to courage and ultimately to reason. His ethics and politics, which according to his Hellenic ideas are one and the same, are calculated for three classes of humanity—the iron, the silver, and the golden. The last two, the military and learned classes, are the only ones taken into account in the educational system of his ideal state; for the proletariat there is no need to be concerned, although Antisthenes and his successors regarded this very class as the only one capable of genuine philosophy. But Plato, like the aristocrat he was, has in view an elect type of humanity, exalted by exceptional intelligence above the brute multitude and the solid middle-class element and called by philosophy,
The teaching of the Sophists had abolished law. Plato likewise knows no law on the lofty level of his ideal state. But the constraint of law seems superfluous where each individual is trained to be the ideal man. Forced by bitter experience to moderate his demands upon human nature and the state towards the end of his life, he sketched in the
The greatest of these Academicians is Aristotle of Stagira, who displayed a versatility and thoroughness of research which appears absolutely incomprehensible in our eyes. Like Plato, he steadfastly held that knowledge is never complete, but that truth is to be found by unremitting persistence in inquiry. This is probably the reason why he gave the world some dialogues adapted to the public taste, and with the help of some of his pupils accumulated and published collections of historico-philological and scientific matter in an unpretentious form; but the systematic lectures in which he propounded to the more advanced followers of his school the results of his speculations and of his wide empirical observation, together with a critical treatment of his predecessors, were never published by him. He worked at these papers his whole life long, and many of the didactic writings which were edited by his pupils after his death, and which are all we possess of the whole body of Aristotle’s works, bear evident traces of gradual growth, correction, and amplification.