Plotinus follows up his essay on the Virtues by an essay on Dialectic.[498] As a method for attaining perfection, he places dialectic above ethics; and, granting that the apprehension of abstract ideas ranks higher than the performance of social duties, he is quite consistent in so doing. Not much, however, can be made of his few remarks on the subject. They seem to be partly meant for a protest against the Stoic idea that logic is an instrument for acquiring truth rather than truth itself, and also against the Stoic use or abuse of the syllogistic method. In modern phraseology, Plotinus seems to view dialectic as the immanent and eternal process of life itself, rather than as a collection of rules for drawing correct inferences from true propositions, or from propositions assumed to be true. We have seen how he regarded existence in the highest sense as identical with the self-thinking of the absolute Nous, and how he attempted to evolve the whole series of archetypal Ideas contained therein from the simple fact of self-consciousness. Thus he would naturally identify dialectic with the subjective reproduction of this objective evolution; and here he would always have before his eyes the splendid programme sketched in Plato’s _Republic_.[499] His preference of intuitive to discursive reasoning has been quoted by Ritter as a symptom of mysticism. But here, as in so many instances, he follows Aristotle, who also held that simple abstraction is a higher operation, and represents a higher order of real existence than complex ratiocination.[500]
The ultimate stage of perfection is, of course, the identification of subject and object, the ascent from the Nous to the One. But, on this point, Plotinus never added anything essential to what has already been quoted from the analytical portion of his enquiry, and the essay containing that passage is accordingly placed last in Porphyry’s arrangement of his works.
Our account of Neo-Platonism has, with the exception of a few illustrations, been derived exclusively from the earlier essays of Plotinus. His subsequent writings are exceedingly obscure and tedious, and they add little by way either of development or defence to the outlines which he had sketched with a master’s hand. Whatever materials they may supply for a better appreciation, whether of his philosophy or of his general character as a thinker, will most profitably find their place in the final survey of both which we shall now attempt to give.