All this is obvious in Plato. The Timaeus was his vision of the universe, in which physical facts became plastic material for the spirit’s power to mould into the likeness of ideal conceptions. The creation of the universe is conformed to the structure of Platonic dialectic. If any meaning be certain through the words and imagery of this dialogue, it is that the world and all creatures which it contains derive such reality as they have from conformity to the thoughts or ideal patterns in the divine mind. Visible things are real only so far as they conform to those perfect conceptions. Moreover, the visible creation has another value, that of its ethical significance. Physical phenomena symbolize the conformity of humanity to its best ideal of conduct. Man may learn to regulate the lawless movements of his soul from the courses of the stars, the noblest of created gods.
Thus as to natural phenomena; and likewise as to the human story, fact or fiction. The myth of the shadow-seers in the cave, with which the seventh book of the Republic opens, is just as illustratively and ideally true as that opening tale in the Timaeus of the ancient Athenian state, which fought for its own and others’ freedom against the people of Atlantis—till the earthquake ended the old Athenian race, and the Atlantean continent was swallowed in the sea. This story has piqued curiosity for two thousand years. Was it tradition, or the creation of an artist dialectician? In either case its ideal and edifying truth stood or fell, not by reason of conformity to any basic antecedent fact, but according to its harmony with the beautiful and good.
Plato’s method of conceiving fact might be applied to man’s thoughts of God, of the origin of the world and the courses of the stars; also to the artistic manipulation of illustrative or edifying story. Matters, large, remote, and mysterious, admit of idealizing ways of apprehension. But it might seem idiocy, rather than idealism, to apply this method to the plain facts of common life, which may be handled and looked at all around—to which there is no mysterious other side, like the moon’s, for ever turned away. Nevertheless the method and its motives drew men from careful observation of nature, and would invest biography and history with interests promoting the ingenious application, rather than the close scrutiny, of fact.
Thus Platonism and its way of treating narrative could not but foster the allegorical interpretation of ancient tradition and literature, which was already in vogue in Plato’s time. It mattered not that he would have nothing to do with the current allegories through which men moralized or rationalized the old tales of the doings of the gods. He was himself a weaver of the loveliest allegories when it served his purpose. And after him the allegorical habit entered into the interpretation of all ancient story. In the course of time allegory will be applied by the Jew Philo of Alexandria to the Pentateuch; and one or two centuries later it will play a great rôle in Christian polemics against Jew and then against Manichean. It will become par excellence the chief mode of patristic exegesis, and pass on as a legacy of spiritual truth to the mediaeval church.
Aristotle strikes us as a man of different type from Plato. Whether his intellectual interests were broader than his teacher’s is hardly for ordinary people to say. He certainly was more actively interested in the investigation of nature. Head of an actual school (as Plato had been), and assisted by the co-operation of able men, he presents himself, with what he accomplished, at least in threefold guise: as a metaphysician and the perfecter, if not creator, of formal logic; as an observer of the facts of nature and the institutions and arts of men; as a man of encyclopaedic learning. These three phases of intellectual effort proportioned each other in a mind of universal power and appetition. Yet it has been thought that there was more metaphysics and formal logic in Aristotle than was good for his natural science.
The lost and extant writings which have been ascribed to him, embraced a hundred and fifty titles and amounted to four hundred books. Those which have been of universal influence upon human inquiry suffice to illustrate the scope of his labours. There were the treatises upon Logic and first among them the Categories or classes of propositions, and the De interpretatione on the constituent parts and kinds of sentences. These two elementary treatises (the authorship of which has been questioned) were the only Aristotelian writings generally used through the West until the latter half of the twelfth century, when the remainder of the logical treatises became known, to wit, the Prior Analytics, upon the syllogism; the Posterior Analytics upon logical demonstration; the Topics, or demonstrations having probability; and the Sophistical Elenchi, upon false conclusions and their refutation. Together these constitute the Organon or complete logical instrument, as it became known to the latter half of the twelfth century, and as we possess it to-day.
The Rhetoric follows, not disconnected with the logical treatises. Then may be named the Metaphysics, and then the writings devoted to Nature, to wit, the Physics, Concerning the Heavens, Concerning Genesis and Decay, the Meteorology, the Mechanical Problems, the History of Animals, the Anatomical descriptions, the Psychology, the Parts of Animals, the Generation of Animals. There was a Botany, which is lost. Finally, one names the great works on Ethics, Politics, and Poetry.
Every one is overwhelmed by the compass of the achievement of this intellect. As to the transcendent value of the works on Logic, Metaphysics, Psychology, Rhetoric, Ethics, Politics, and Poetry, the world of scholarship has long been practically at one. There is a difference of opinion as to the quantity and quality of actual investigation represented by the writings on Natural History. But Aristotle is commonly regarded as the founder of systematic Zoology. On the whole, perhaps one will not err in repeating what has been said hundreds of times, that the works ascribed to Aristotle, and which undoubtedly were produced by him or his co-labourers under his direction, represent the most prodigious intellectual achievement ever connected with any single name.
In the school of Aristotle, one phase or another of the master’s activity would be likely to absorb the student’s energy and fasten his entire attention. Aristotle’s own pupil and successor was the admirable Theophrastus, a man of comprehensive attainment, who nevertheless devoted himself principally to carrying on his master’s labours in botany, and other branches of natural science. A History of Physics was one of the most important of his works. Another pupil of Aristotle was Eudemus of Rhodes, who became a physicist and a historian of the three sciences of Geometry, Arithmetic, and Astronomy. He exhibits the learned activities thenceforth to characterize the Peripatetics. It would have been difficult to carry further the logic or metaphysics of the master. But his work in natural science might be supplemented, while the body of his writings offered a vast field for the labours of the commentator. And so, in fact, Peripatetic energies in the succeeding generations were divided between science and learning, the latter centring chiefly in historical and grammatical labours and the exposition of the master’s writing.[35]
Aristotelianism was not to be the philosophy of the closing pre-Christian centuries, any more than it was to be the philosophy of the thousand years and more following the Crucifixion. During all that time, its logic held its own, and a number of its metaphysical principles were absorbed in other systems. But Aristotelianism as a system soon ceased to be in vogue, and by the sixth century was no longer known.