These four characteristics of Universality, Conversion, Unification, Transcendence, we find them together in Greek philosophy once, and once only, namely in Plato. Twice again we have indeed a world-embracing, world-moving scheme placed before us, and in each case two of these four characteristics reappear in a deepened and developed form. For Aristotle works out, more fully and satisfactorily than Plato, the characters of Universality and of Unification; especially does the latter find a great improvement. And Plotinus insists, even more constantly and movingly than Plato, upon Conversion as a necessary means, and upon Transcendence as a necessary characteristic of all true philosophy. But Aristotle has lost the Conversion from out of his scheme, and also the Transcendence conceived as at the same time immanent in the world; and Plotinus has lost the Universality, and the Unification conceived as a Unity in Multiplicity. 4. _In Aristotle._ As to Aristotle, the improvements upon Plato are marked and many. There is the doctrine of the non-existence of the General apart from the Particular; the doctrine of Matter as not simple Non-Being, but as Not-yet-Being, the Possible, the Not-yet-Actual, which is waiting the presence of the Form to give it the Actuality for which it is destined, since Matter requires Form, and Form requires Matter; and the doctrine, here first fully developed, of Motion, the Moved and the Moving. Since all Motion, Change, Natural Life spring from Form (and a particular Form), working in and with Matter (a particular and appropriate Matter), the ultimate First Moving Cause must Itself be all-moving and all-unmoved, that is, it must be Pure Form. We thus get the first at all adequate philosophical presentation of Theism: for this Pure Form is then shown to be eternal, unchanging, all thought, self-thinking, and absolutely distinct from the world which it moves. In all other real Beings the Form has, in various degrees, to contend with the manifold impediments of Matter; and in proportion to the Form’s success, does the resultant Being stand high in the scale of Creation. The plant, with its vegetative and plastic soul, stands lowest in the scale of organic life; next comes the animal, with its sensitive and motive soul; and highest stands man, with his rational and volitional soul. And each higher Being takes over, as the lower part of his own nature, the functions and powers of the lower Being; and hence, since all Beings constitute so many several parts of the world’s systematic whole, they are all deserving of the closest study. And Man, destined to be the highest constituent of this whole, can become so only by moving as much as may be out of his entanglement in the lower, the passive functions of his soul, and identifying himself with his true self, with that active power, that pure reason which, itself pure Form, finds its proper objects in the Forms of all things that are.