For as to the motives, it ought not to be difficult to any one who knows human history and human nature, to see how the all but complete estrangement from Nature and Physical Fact which, from Socrates onwards, with the but very partial exception of Aristotle, had, for well-nigh two thousand years, preceded this reaction; how the treatment of Matter and the Visible as more or less synonymous with Non-Being and Irrationality, as a veil or even a wall, as a mere accident or even a positive snare, lying everywhere between us and Reality, could not fail to require and produce a swing of the pendulum in the opposite direction. And the feeling and the perception of how superficial and unreal, how oppressively confined, how intolerably fixed and ultimate, how arrogant and cold and fruitless, such persistent neglect of the Data of Sense had somehow, at last, rendered philosophy, gave now polemical edge to men’s zealous study and discovery of _this_ world. This study was perceived, even by the shallower thinkers, to be fair and rational and fruitful in itself; and it was found, by some few deep spirits, to be a strangely potent means of purifying, enlarging, “deprovincializing” man himself. The severe discipline of a rigorous study of man’s lowly, physical conditions and environment, things hitherto so despised by him, was now at last to purify him of his own childish immediacy of claim. The pettily selfish, shouting Individual was to pass through the broad, still, purgatorial waters of a temporary submergence under the conceptions, as vivid as though they were direct experiences, of ruthless Law, of Mechanism, of the Thing; so as to pass out, purified and enlarged, a Person, expressive of the Universal and Objective, of Order and of Law.