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, he thought virtue; in which he agreed with Socrates that the mind has the principal share.