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FORE:The famous theses of Gorgias were quoted in a former chapter as an illustration of the tactics pursued by Greek Humanism in its controversy with physical science. They must be noticed again in the present connexion, on account of their bearing on the development of scepticism, and as having inaugurated a method of reasoning often employed in subsequent attacks, directed, not against the whole of knowledge, but against particular parts of it. The scepticism of Protagoras rested on the assumption that there is an external reality from the reaction of which with mind all our perceptions proceed. Neither of these two factors can be known apart from the other, and as both are in a constant flux, our knowledge of the resulting compound at one time does not show what it has been or will be at another time. But Gorgias altogether denied the existence of any objective reality; and he attempted to disprove it by an analytical instead of a synthetic argument, laying down a series of disjunctive propositions, and upsetting the different alternatives in succession. Existence must be either something or nothing, or both together; and if something, it must be either finite or infinite, or both, and either one or many, or both. His argument against an infinite existence is altogether futile; but it serves to illustrate the undeveloped state of reflection at that period. The eternity of the world is confounded with its unlimited extension in space: and this hypothesis, again, is met by the transparent quibble that the world, not being in any one place, must be nowhere or not at all. And the alternative that the world has not always existed is refuted by the unproved assumption, which, apparently, no Greek philosopher ever thought of disputing, that nothing can begin without being caused by something else. Still, however contemptible such reasonings may seem,131 it is obvious that in them we have the first crude form of the famous antinomies by which Kant long afterwards sought to prove the impossibility of a world existing in space and time apart from a percipient subject, and which have since been used to establish in a more general way the unknowability of existence as such. It will also be observed that the sceptical arguments respectively derived from the relativity of thought and from the contradictions inherent in its ultimate products are run together by modern agnostics. But no reason that we can remember has ever been given to show that an idea is necessarily subjective because it is self-contradictory.

FORE:247It must further be noted that disbelief in a future life, as a philosophical principle, was not confined to the Epicureans. All philosophers except the Platonists and Pythagoreans were materialists; and no logical thinker who had once applied his mind to the subject could accept such an absurdity as the everlasting duration of a complex corporeal substance, whether consisting of gaseous or of fiery matter. A majority of the Stoics allowed the soul to continue its individual existence until, in common with the whole world, it should be reabsorbed into the elemental fire; but others looked forward to a more speedy extinction, without ceasing on that account to consider themselves orthodox members of the school. Of these the most remarkable instance is Marcus Aurelius. The great emperor was not blind to what seemed the enormous injustice of death, and did not quite see his way to reconciling it with the Stoic belief in a beneficent providence; but the difficulty of finding room for so many ghosts, and perhaps also the Heracleitean dogma of perpetual transformation, led him to renounce whatever hope he may at one time have cherished of entering on a new existence in some better world.359 A similar consequence was involved in the principles of the Peripatetic philosophy; and Alexander of Aphrodisias, the famous Aristotelian commentator, who flourished about 200 A.D., affirms the perishable nature of the soul on his own account, and, with perfect justice, attributes the same belief to Aristotle himself.360