Plato’s philosophy had two stages through which it of necessity developed and worked its way up to a higher principle. The universal which is in reason had first to fall into two divisions opposed to each other in the most direct and unmitigated contradiction, in the independence of the personal consciousness which exists for itself: thus in the New Academy self-consciousness goes back into itself, and becomes a species of scepticism—the negative reason, which turns against all that is universal, and fails to find the unity of self-consciousness and the universal, coming accordingly to a standstill at that point. But, in the second place, the Neo-Platonists constitute the return, this unity of self-consciousness and the absolute essence; to them God is directly present in reason, reasoned knowledge itself is the Divine Spirit, and the content of this knowledge is the Being of God. Both of these we shall consider later. B. ARISTOTLE. Here we leave Plato, and we do so with regret. But seeing that we pass to his disciple, Aristotle, we fear that it behoves us to enter even more into detail, since he was one of the richest and deepest of all the scientific geniuses that have as yet appeared—a man whose like no later age has ever yet produced. Because we still possess so large a number of his works, the extent of the material at hand is proportionately greater; unfortunately, however, I cannot give to Aristotle the amount of attention that he deserves. For we shall have to confine ourselves to a general view of his philosophy, and simply remark on one particular phase of it, viz. in how far Aristotle in his philosophy carried out what in the Platonic principle had been begun, both in reference to the profundity of the ideas there contained, and to their expansion; no one is more comprehensive and speculative than he, although his methods are not systematic.