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So then, having briefly passed in review the various principles of moral philosophy, we may now arrange our goods in order, though, like the reader of the Philebus, we have a difficulty in distinguishing the different aspects of them from one another, or defining the point at which the human passes into the divine.

First, the eternal will of God in this world and in another,—justice, holiness, wisdom, love, without succession of acts (ouch e genesis prosestin), which is known to us in part only, and reverenced by us as divine perfection.

Secondly, human perfection, or the fulfilment of the will of God in this world, and co-operation with his laws revealed to us by reason and experience, in nature, history, and in our own minds.

Thirdly, the elements of human perfection,—virtue, knowledge, and right opinion.

Fourthly, the external conditions of perfection,—health and the goods of life.

Fifthly, beauty and happiness,—the inward enjoyment of that which is best and fairest in this world and in the human soul.

...

The Philebus is probably the latest in time of the writings of Plato with the exception of the Laws. We have in it therefore the last development of his philosophy. The extreme and one-sided doctrines of the Cynics and Cyrenaics are included in a larger whole; the relations of pleasure and knowledge to each other and to the good are authoritatively determined; the Eleatic Being and the Heraclitean Flux no longer divide the empire of thought; the Mind of Anaxagoras has become the Mind of God and of the World. The great distinction between pure and applied science for the first time has a place in philosophy; the natural claim of dialectic to be the Queen of the Sciences is once more affirmed. This latter is the bond of union which pervades the whole or nearly the whole of the Platonic writings. And here as in several other dialogues (Phaedrus, Republic, etc.) it is presented to us in a manner playful yet also serious, and sometimes as if the thought of it were too great for human utterance and came down from heaven direct. It is the organization of knowledge wonderful to think of at a time when knowledge itself could hardly be said to exist. It is this more than any other element which distinguishes Plato, not only from the presocratic philosophers, but from Socrates himself.

We have not yet reached the confines of Aristotle, but we make a somewhat nearer approach to him in the Philebus than in the earlier Platonic writings. The germs of logic are beginning to appear, but they are not collected into a whole, or made a separate science or system. Many thinkers of many different schools have to be interposed between the Parmenides or Philebus of Plato, and the Physics or Metaphysics of Aristotle. It is this interval upon which we have to fix our minds if we would rightly understand the character of the transition from one to the other. Plato and Aristotle do not dovetail into one another; nor does the one begin where the other ends; there is a gulf between them not to be measured by time, which in the fragmentary state of our knowledge it is impossible to bridge over. It follows that the one cannot be interpreted by the other. At any rate, it is not Plato who is to be interpreted by Aristotle, but Aristotle by Plato. Of all philosophy and of all art the true understanding is to be sought not in the afterthoughts of posterity, but in the elements out of which they have arisen. For the previous stage is a tendency towards the ideal at which they are aiming; the later is a declination or deviation from them, or even a perversion of them. No man's thoughts were ever so well expressed by his disciples as by himself.

But although Plato in the Philebus does not come into any close connexion with Aristotle, he is now a long way from himself and from the beginnings of his own philosophy. At the time of his death he left his system still incomplete; or he may be more truly said to have had no system, but to have lived in the successive stages or moments of metaphysical thought which presented themselves from time to time. The earlier discussions about universal ideas and definitions seem to have died away; the correlation of ideas has taken their place. The flowers of rhetoric and poetry have lost their freshness and charm; and a technical language has begun to supersede and overgrow them. But the power of thinking tends to increase with age, and the experience of life to widen and deepen. The good is summed up under categories which are not summa genera, but heads or gradations of thought. The question of pleasure and the relation of bodily pleasures to mental, which is hardly treated of elsewhere in Plato, is here analysed with great subtlety. The mean or measure is now made the first principle of good. Some of these questions reappear in Aristotle, as does also the distinction between metaphysics and mathematics. But there are many things in Plato which have been lost in Aristotle; and many things in Aristotle not to be found in Plato. The most remarkable deficiency in Aristotle is the disappearance of the Platonic dialectic, which in the Aristotelian school is only used in a comparatively unimportant and trivial sense. The most remarkable additions are the invention of the Syllogism, the conception of happiness as the foundation of morals, the reference of human actions to the standard of the better mind of the world, or of the one 'sensible man' or 'superior person.' His conception of ousia, or essence, is not an advance upon Plato, but a return to the poor and meagre abstractions of the Eleatic philosophy. The dry attempt to reduce the presocratic philosophy by his own rather arbitrary standard of the four causes, contrasts unfavourably with Plato's general discussion of the same subject (Sophist). To attempt further to sum up the differences between the two great philosophers would be out of place here. Any real discussion of their relation to one another must be preceded by an examination into the nature and character of the Aristotelian writings and the form in which they have come down to us. This enquiry is not really separable from an investigation of Theophrastus as well as Aristotle and of the remains of other schools of philosophy as well as of the Peripatetics. But, without entering on this wide field, even a superficial consideration of the logical and metaphysical works which pass under the name of Aristotle, whether we suppose them to have come directly from his hand or to be the tradition of his school, is sufficient to show how great was the mental activity which prevailed in the latter half of the fourth century B.C.; what eddies and whirlpools of controversies were surging in the chaos of thought, what transformations of the old philosophies were taking place everywhere, what eclecticisms and syncretisms and realisms and nominalisms were affecting the mind of Hellas. The decline of philosophy during this period is no less remarkable than the loss of freedom; and the two are not unconnected with each other. But of the multitudinous sea of opinions which were current in the age of Aristotle we have no exact account. We know of them from allusions only. And we cannot with advantage fill up the void of our knowledge by conjecture: we can only make allowance for our ignorance.