THREE:That Virgil was acquainted with this philosophy and had accepted some of its principal conclusions is evident from a famous passage in the Sixth Aeneid,282 setting forth the theory of a universal and all-penetrating soul composed of fiery matter, whence the particular souls of men and animals are derived, by a process likened to the scattering and germination of seeds; from another equally famous passage in the Fourth Eclogue,283 describing the periodical recurrence of events in the same order as before; and also, although to a less extent, from his acceptance of the Stoic astronomy in the Georgics;284 a circumstance which, by the way, renders it most unlikely that he looked up to Lucretius as an authority in physical science.285 But even apart from this collateral evidence, one can see that the Aeneid is a Stoic poem. It is filled with the ideas of mutation and vicissitude overruled by a divinely appointed order; of the prophetic intimations by which that order is revealed; of the obedience to reason by which passion is subdued; and of the faith in divine goodness by which suffering is made easy to be borne. And there are also gleams of that universal humanity familiar to Stoicism, which read to some like an anticipation of the Christian or the modern spirit, but which really resemble them only as earlier manifestations of the same great philosophical movement.
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TWO:From this grand synthesis, however, a single element was omitted; and, like the uninvited guest of fairy tradition, it proved strong enough singly to destroy what had been constructed by the united efforts of all the rest. This was the sceptical principle, the critical analysis of ideas, first exercised by Protagoras, made a new starting-point by Socrates, carried to perfection by Plato, supplementing experience with Aristotle, and finally proclaimed in its purity as the sole function of philosophy by an entire school of Greek thought.