The reader will remember how men in the Roman Empire condemned “magic” but understood the word in a restricted and bad sense; how Pliny made pretensions to complete freedom from all belief in magic and how inconsistent was his actual attitude; how Seneca rejected magic only in part, accepting divination in all its ramifications. This partial rejection and partial acceptance of magic by the same individual seem characteristic of the age of the Empire, as one would expect of a time when magic was in a state of decay and science in a process of development. It is true that this rejection of certain varieties of magic often proceeded from the motive of morality rather than of scepticism. Thus in Cicero’s _De Divinatione_, Quintus Cicero is represented as closing his long argument in favor of the truth of divination by solemnly asserting that he does not approve of sorcerers, nor of those who prophesy for sake of gain, nor of the practice of questioning spirits of the dead—which nevertheless, he says, was a custom of his brother’s friend Appius.[193] But there were some men, we may well believe, who would reject even those varieties of magic which found a welcome in the minds of most educated people and in the general mass of the thought and science of the age. Such cases we shall now consider. I. _Opponents of astrology._—Astrology, as we have seen, was very popular. Yet there was some scepticism as to its truth beyond the ridicule of satirists, who perhaps at bottom were themselves believers in the art. Outside of Christian writers the three chief opponents of astrology in the Roman world, judging by the works that have come down to us, were Cicero—who lived before the Empire in the constitutional sense can be said to have begun—in his _De Divinatione_; Favorinus, a Gaul who resided at Rome in the reigns of Hadrian and Trajan, and was a friend of Plutarch, and whose arguments against astrology have been preserved only in the pages of Aulus Gellius; and Sextus Empiricus, a physician who flourished at about the beginning of the third century of our era.[194]