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THREE:Nevertheless, in each case, subjective idealism had the effect of concentrating speculation, properly so called, on ethical and practical interests. Locke struck the keynote of eighteenth century philosophy when he pronounced morality to be ��the proper science and business of mankind in general.��574 And no sooner had morality come to the front than the significance of ancient thought again made itself apparent. Whether through conscious imitation, or because the same causes brought about the same effects, ethical enquiries moved along the lines originally laid down in the schools of Athens. When rules of conduct were not directly referred to a divine revelation, they were based either on a supposed law of Nature, or on the necessities of human happiness, or on some combination of the two. Nothing is more characteristic of422 the eighteenth century than its worship of Nature. Even the theology of the age is deeply coloured by it; and with the majority of those who rejected theology it became a new religion. But this sentiment is demonstrably of Greek origin, and found its most elaborate, though not its most absolute, expression in Stoicism. The Stoics had inherited it from the Cynics, who held the faith in greater purity; and these, again, so far as we can judge, from a certain Sophistic school, some fragments of whose teaching have been preserved by Xenophon and Plato; while the first who gave wide currency to this famous abstraction was, in all probability, Heracleitus. To the Stoics, however, is due that intimate association of naturalism with teleology which meets us again in the philosophy of the last century, and even now wherever the doctrine of evolution has not been thoroughly accepted. It was assumed, in the teeth of all evidence, that Nature bears the marks of a uniformly beneficent design, that evil is exclusively of human origin, and that even human nature is essentially good when unspoiled by artificial restrictions.Once credited with a continued existence, the departed spirit would not remain in the Hades or the Elysium provided for it by the justice or the piety, of the survivor, but persisted in returning to this world and manifesting a most uncomfortable interest in its affairs; or, even if willing to remain at rest, it was liable to be dragged back by incantations, and compelled to reveal the secrets of futurity at the bidding of an unprincipled magician. What science and good feeling combined have proved unable to keep down among ourselves, naturally raged with unmitigated virulence at a time when the primitive barbarism and superstition were only covered over by a crust of culture which at many points was growing thinner every day. Among Latin writers, the younger Pliny, Suetonius, and Apuleius, among Greek writers, Plutarch, Pausanias, Maximus Tyrius, Philostratus, and Dion Cassius, afford unequivocal evidence of their belief and the belief of their contemporaries in ghostly apparitions; and Lucian, while rejecting ghost-stories on his own account, speaks as if they were implicitly accepted even in philosophical circles.372 Still more abundant is the evidence proving the frequency of attempts made to evoke spirits by means of magical incantations. Horace��s Canidia boasts that she can raise the dead even after their bodies have been burned.373 Lucan describes the process of conjuring up a ghost at length; and it is thought that he inserted the whole scene in his poem as a satire on the emperor Nero, who is known to have been addicted to such practices, as were also his successors, Didius Julianus, Caracalla, and Elagabalus. And that the same art was cultivated by private persons is clear from the allusions made to it by Quintilian, Apuleius, Tertullian, and Heliod?rus.374