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.Nor was this the only reason why the spiritualists lost touch of their age. If in some respects they were far in advance of early Greek thought, in other respects they were far behind it. Their systems were pervaded by an unphilosophical dualism which tended to undo much that had been achieved by their less prejudiced predecessors. For this we have partly to blame their environment. The opposition of God and the world, heaven and earth, mind and matter, necessity in Nature and free-will in man, was a concessionthough of course an unconscious concessionto the stupid3 bigotry of Athens. Yet at the same time they had failed to solve those psychological problems which had most interest for an Athenian public. Instead of following up the attempt made by the Sophists and Socrates to place morality on a scientific foundation, they busied themselves with the construction of a new machinery for diminishing the efficacy of temptation or for strengthening the efficacy of law. To the question, What is the highest good? Plato gave an answer which nobody could understand, and Aristotle an answer which was almost absolutely useless to anybody but himself. The other great problem, What is the ultimate foundation of knowledge? was left in an equally unsatisfactory state. Plato never answered it at all; Aristotle merely pointed out the negative conditions which must be fulfilled by its solution.
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