Grote remarks further, (and this remark is particularly worth remembering in the reading of Cicero's philosophical works,) that “Arcesilaus and the New Academy thought that they were following the example of Socrates, (and Cicero appears to have thought so too,) when they reasoned against everything, and laid it down as a system, that against every affirmative position an equal force of negative argument could be brought as a counterpoise: now this view of Socrates is, in my judgment, not only partial, but incorrect. He entertained no such doubts of the powers of the mind to attain certainty. About physics he thought man could know nothing; but respecting the topics which concern man and society, this was the field which the Gods had expressly assigned, not merely to human practice, but to human study and knowledge; and he thought that every man, not only might know these things, but ought to know them; that he could not possibly act well unless he did know them; and that it was his imperative duty to learn them as he would learn a profession, otherwise he was nothing better than a slave, unfit to be trusted as a free and accountable being. He [pg xvii] was possessed by the truly Baconian idea, that the power of steady moral action depended upon, and was limited by, the rational comprehension of moral ends and means.”
The system, then, of Socrates was animated by the truest spirit of positive science, and formed an indispensable precursor to its attainment. And we may form some estimate of his worth and genius if we recollect, that while the systems and speculations of other ancient philosophers serve only as curiosities to make us wonder, or as beacons to warn us into what absurdities the ablest men may fall, the principles and the system of Socrates and his followers, and of that school alone, exercise to this day an important influence on all human argument and speculation.
Aristippus (whom we will consider before Plato, that Aristotle may follow Plato more immediately) came when a young man to Athens, for the express purpose of becoming acquainted with Socrates, with whom he remained almost till his death. He was, however, very different from his master, being a person of most luxurious and sensual habits. He was also the first of Socrates' disciples who took money for teaching. He was the founder of the Cyrenaic school of philosophy, which followed Socrates in limiting all philosophical inquiries to ethics; though under this name they comprehended a more varied range of subjects than Socrates did, inasmuch as one of the parts into which they divided philosophy, referred to the feelings; another to causes, which is rather a branch of physics; and a third to proofs, which is clearly connected with logic.
He pronounced pleasure to be the chief good, and pain the chief evil; but he denied that either of these was a mere negative inactive state, considering them, on the contrary, both to be motions of the soul,—pain a violent, and pleasure a moderate one.
As to actions, he asserted that they were all morally indifferent, that men should only look to their results, and that law and custom are the only authorities which make an action either good or bad. Whatever conduces to pleasure, [pg xviii] he thought virtue; in which he agreed with Socrates that the mind has the principal share.
Plato, the greatest of all the disciples of Socrates, was the son of Ariston and Perictione, and was born probably in the year b.c. 428, and descended, on the side of his father, from Codrus, and on his mother's side related to Solon. At the age of twenty, he became a constant attendant of Socrates, and lived at Athens till his death. After this event, in consequence of the unpopularity of the very name of his master, he retired to Megara, and subsequently to Sicily. He is said also to have been at some part of his life, after the death of Socrates, a great traveller. About twelve years after the death of Socrates he returned to Athens, and began to teach in the Academy, partly by dialogue, and partly, probably, by connected lectures. He taught gratuitously; and besides Speusippus, Xenocrates, Aristotle, Heraclides Ponticus, and others, who were devoted solely to philosophical studies, he is said to have occasionally numbered Chabrias, Iphicrates, Timotheus, Phocion, Isocrates, and (by some) Demosthenes among his hearers. He died at a great age, b.c. 347.
His works have come down to us in a more complete form than those of any other ancient author who was equally voluminous; and from them we get a clear idea of the principal doctrines which he inculcated on his followers.
Like Socrates, he was penetrated with the idea, that knowledge and wisdom were the things most necessary to man, and the greatest goods assigned to him by God. Wisdom he looked on as the great purifier of the soul; and as any approach to wisdom presupposes an original communion with Being, properly so called, this communion also presupposes the divine nature, and consequent immortality of the soul, his doctrine respecting which was of a much purer and loftier character than the usual theology of the ancients. Believing that the world also had a soul, he considered the human soul as similar to it in nature, and free from all liability to death, in spite of its being bound up with the appetites, in consequence of its connexion with the body, and as preserving [pg xix] power and consciousness after its separation from the body. What he believed, however, to be its condition after death is far less certain, as his ideas on this subject are expressed in a mythical form.
The chief point, however, to which Plato directed his attention, was ethics, which, especially in his system, are closely connected with politics. He devotes the Protagoras, and several shorter dialogues, to refute the sensual and selfish theories of some of his predecessors, in order to adopt a more scientific treatment of the subject; and in these dialogues he urges that neither happiness nor virtue are attainable by the indulgence of our desires, but that men must bring these into proper restraint, if they are desirous of either. He supposes an inward harmony, the preservation of which is pleasure, while its disturbance is pain; and as pleasure is always dependent on the activity from which it springs, the more this activity is elevated the purer the pleasure becomes.
Virtue he considered the fitness of the soul for the operations that are proper to it; and it manifests itself by means of its inward harmony, beauty, and health. Different phases of virtue are distinguishable so far as the soul is not pure spirit, but just as the spirit should rule both the other elements of the soul, so also should wisdom, as the inner development of the spirit, rule the other virtues.