ONE:Now it was by this side of Platonism that Aristotle also had been most deeply fascinated. While constantly criticising the ideal theory, he had, in truth, accepted it under a modified form. His universal classification is derived from the dialectic method. His psychology and theology are constructed on287 the spiritualistic basis of the Academy, and out of materials which the founder of the Academy had supplied. It was therefore natural that Plotinus should avail himself largely of the Stagirite��s help in endeavouring to reproduce what a tradition of six centuries had obscured or confused. To reconcile the two Attic masters was, as we know, a common school exercise. Learned commentators had, indeed, placed their disagreement beyond all dispute. But there remained the simpler course of bringing their common standpoint into greater prominence, and combining their theories where this seemed possible without too openly renouncing the respect due to what almost all considered the superior authority of Plato. To which of the two masters Neo-Platonism really owed most is a question that must be postponed until we have made ourselves acquainted with the outlines of the system as they appear in the works of Plotinus.It is never enough to know that any piece of work is commonly constructed in some particular manner, or that a proposition is generally accepted as being correct; a reason should be sought for. Nothing is learned, in the true sense, until the reasons for it are understood, and it is by no means sufficient to know from observation alone that belts are best for high speeds, that gearing is the best means of forming angles in transmitting power, or that gearing consumes more power, and that belts produce less jar and noise; the principles which lie at the bottom must be reached before it can be assumed that the matter is fairly understood.