When, however, we come to examine both the men and their arguments, we somehow do not find their assault upon astrology especially impressive or satisfactory. First, as to the men. Gellius says that he heard Favorinus make the speech the substance of which he repeats, but that he is unable to state whether the philosopher really meant what he said or argued merely in order to exercise and to display his genius.[[195]] There was reason for this perplexity of Gellius, since Favorinus was fond of writing such essays as Eulogies of Thersites and of Quartan Fever. There is no particular reason for doubting Sextus’s seriousness, but, besides being a medical man, he was a member of the sceptical school of philosophy, a circumstance which warns one not to attribute too much emphasis to his attack on astrology. Indeed, the attack occurs in a work directed against learning in general, in which he assails grammarians, rhetoricians, geometricians, arithmeticians, students of music, logicians, “physicists,” and students of ethics as well as astrologers. Cicero was not prone to such sweeping scepticism or sophistry, but the force of his opposition to astrology is somewhat neutralized by the fact that in his Dream of Scipio he apparently attributes to planets influence over man.
Now as to their arguments. We have spoken of their “attack on astrology,” but in reality they can scarcely be said to attack astrology as a whole. Indeed, it is the doctrines of the Chaldeans which Cicero makes the object of his assault; he says nothing about astrology. Favorinus will not even admit that he attacks the “disciplina Chaldaeorum” in any true sense, but affirms that the Chaldeans were not the authors of such theories at all, but that these have originated of late among traveling fakirs who beg their bread by means of such deceits and trickeries.[[196]] Some of the arguments of our sceptics are really directed merely against the methods of interpreting the decrees of the stars which they give us to understand that the astrologers employ. Such objections might suffice to pierce the presumption of the ordinary popular astrologer but they fall back blunted from the system of Ptolemy.[[197]] If our sceptics thought that they were overthrowing the astrology of the man of learning by such arguments, they labored under a misapprehension, and in the eyes of one who really understood the art must have cut the figure of ignoramuses making false charges against a science of which they knew next to nothing.
As some of the arguments of our sceptics apply solely to defects in method of which the best astrologers were not guilty, so others do not deny the existence of sidereal influence over the life of man, but contend that it is impossible to determine with essential accuracy what will be the effects of that influence. Sextus, for example, seems to lay most stress upon such points as the difficulty of exactly determining the date of birth or of conception, or the precise moment when a star passes into a new sign of the zodiac. He calls attention to the fact that observers at varying altitudes, as well as in different localities, would arrive at different conclusions, that differences in eyesight would also affect results, and that it is hard to tell just when the sun sets owing to refraction.[[198]] He almost becomes scholastic in the minuteness of his objections, leaving us somewhat in doubt whether they are to be taken as indicative of a spirit of captious criticism towards an art the fundamental principles of which he tacitly recognized as well-nigh incontestible, or whether he is simply trying to make his case doubly sure by showing astrology to be impracticable as well as unreasonable.
The main thing to be noted about Cicero, Favorinus and Sextus is that they pay almost no attention to the general problem of sidereal influence on terrestrial matter and life. It is to the denial of an absolute, complete and immutable rule of the heavenly bodies over man that they devote their energies. The premises of astrology they leave pretty much alone. One might accept almost all their statements and still believe in a large influence of the stars over our physical characteristics and mental traits. The question of sidereal influence upon lower animal life, vegetation and inert matter they avoid with a sneer.[[199]]
II. Cicero’s attack upon divination.—A more satisfactory example of scepticism may be found in other chapters of the De Divinatione than those which assail the art of the Chaldeans. Moreover, although the discussion is limited to the specific theme of divination, still that is a subject which admits of very broad interpretation, and Cicero employs some arguments which are capable of an even wider application and oppose the hypotheses on which magic in general rests. He rejects divination as unscientific. It is to such arguments that we shall confine our attention. “Natural divination,” that is, predictions made under direct divine inspiration without interposition of signs and portents, is not magic and so the discussion of it will not concern us. Much less shall we waste any time over such trite contentions against divination in general as that there is no use of knowing predetermined events since you cannot avoid them,[[200]] and that even if we can learn the future we shall be happier not to do it.
De Divinatione takes the form of a suppositious conversation, or better, informal debate, between the author and his brother Quintus. In the first book Quintus, in a rather rambling and leisurely fashion, and with occasional repetition of ideas, upholds divination to the best of his ability, citing many reported instances of successful recourse to it in antiquity. In the second book Tully proceeds, with an air of somewhat patronizing superiority, to pull entirely to pieces the arguments of his brother, who assents with cheerful readiness to their demolition.
It is interesting to note that as Pliny’s magic was not his own, so Cicero’s scepticism did not originate wholly with himself. As his other philosophical writings draw their material largely from Greek philosophy, so the second book of the De Divinatione is supposed to have been under considerable obligations to Clitomachus and Panætius.[[201]] As for the future, the De Divinatione was known in the Middle Ages but its influence seems to have often been scarcely that intended by its author.
One of the main points in the argument of Quintus had been his appeal to the past. What race or state, he asked, has not believed in some form of divination?
For before the revelation of philosophy, which was discovered recently, public opinion had no doubt of the truth of this art; and after philosophy came forth no philosopher of authority thought otherwise. I have mentioned Pythagoras, Democritus, Socrates. I have left out no one of the ancients save Xenophanes. I have added the Old Academy, the Peripatetics, the Stoics. Epicurus alone dissented.[[202]]
When Tully’s turn to speak came, he rudely disturbed his brother’s reliance upon tradition. “I think it not the part of a philosopher to employ witnesses, who are only haply true, often purposely false and deceiving. He ought to show why a thing is so by arguments and reasons, not by events, especially those I cannot credit.”[[203]] “Antiquity,” Cicero declared later, “has erred in many respects.”[[204]] The existence of the art of divination in every age and nation had little effect upon him. There is nothing, he asserted, so widespread as ignorance.[[205]]