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a kind of speech predicting, not causing future things,—for this has been the opinion of men of no ordinary learning,—certainly the mathematicians are not wont so to speak, saying, for example, Mars in such or such a position signifies a homicide, but makes a homicide. But, nevertheless, though we grant that they do not speak as they ought, and that we ought to accept as the proper form of speech that employed by the philosophers in predicting those things which they think they discover in the position of the stars, how comes it that they have never been able to assign any cause why, in the life of twins, in their actions, in the events which befall them, in their professions, arts, honours, and other things pertaining to human life, also in their very death, there is often so great a difference, that, as far as these things are concerned, many entire strangers are more like them than they are like each other, though separated at birth by the smallest interval of time, but at conception generated by the same act of copulation, and at the same moment?

      2. On the difference in the health of twins.

      Cicero says that the famous physician Hippocrates has left in writing that he had suspected that a certain pair of brothers were twins, from the fact that they both took ill at once, and their disease advanced to its crisis and subsided in the same time in each of them.185 Posidonius the Stoic, who was much given to astrology, used to explain the fact by supposing that they had been born and conceived under the same constellation. In this question the conjecture of the physician is by far more worthy to be accepted, and approaches much nearer to credibility, since, according as the parents were affected in body at the time of copulation, so might the first elements of the fœtuses have been affected, so that all that was necessary for their growth and development up till birth having been supplied from the body of the same mother, they might be born with like constitutions. Thereafter, nourished in the same house, on the same kinds of food, where they would have also the same kinds of air, the same locality, the same quality of water,—which, according to the testimony of medical science, have a very great influence, good or bad, on the condition of bodily health,—and where they would also be accustomed to the same kinds of exercise, they would have bodily constitutions so similar that they would be similarly affected with sickness at the same time and by the same causes. But, to wish to adduce that particular position of the stars which existed at the time when they were born or conceived as the cause of their being simultaneously affected with sickness, manifests the greatest arrogance, when so many beings of most diverse kinds, in the most diverse conditions, and subject to the most diverse events, may have been conceived and born at the same time, and in the same district, lying under the same sky. But we know that twins do not only act differently, and travel to very different places, but that they also suffer from different kinds of sickness; for which Hippocrates would give what is in my opinion the simplest reason, namely, that, through diversity of food and exercise, which arises not from the constitution of the body, but from the inclination of the mind, they may have come to be different from each other in respect of health. Moreover, Posidonius, or any other asserter of the fatal influence of the stars, will have enough to do to find anything to say to this, if he be unwilling to impose upon the minds of the uninstructed in things of which they are ignorant. But, as to what they attempt to make out from that very small interval of time elapsing between the births of twins, on account of that point in the heavens where the mark of the natal hour is placed, and which they call the "horoscope," it is either disproportionately small to the diversity which is found in the dispositions, actions, habits, and fortunes of twins, or it is disproportionately great when compared with the estate of twins, whether low or high, which is the same for both of them, the cause for whose greatest difference they place, in every case, in the hour on which one is born; and, for this reason, if the one is born so immediately after the other that there is no change in the horoscope, I demand an entire similarity in all that respects them both, which can never be found in the case of any twins. But if the slowness of the birth of the second give time for a change in the horoscope, I demand different parents, which twins can never have.

      3. Concerning the arguments which Nigidius the mathematician drew from the potter's wheel, in the question about the birth of twins.

      It is to no purpose, therefore, that that famous fiction about the potter's wheel is brought forward, which tells of the answer which Nigidius is said to have given when he was perplexed with this question, and on account of which he was called Figulus.186 For, having whirled round the potter's wheel with all his strength, he marked it with ink, striking it twice with the utmost rapidity, so that the strokes seemed to fall on the very same part of it. Then, when the rotation had ceased, the marks which he had made were found upon the rim of the wheel at no small distance apart. Thus, said he, considering the great rapidity with which the celestial sphere revolves, even though twins were born with as short an interval between their births as there was between the strokes which I gave this wheel, that brief interval of time is equivalent to a very great distance in the celestial sphere. Hence, said he, come whatever dissimilitudes may be remarked in the habits and fortunes of twins. This argument is more fragile than the vessels which are fashioned by the rotation of that wheel. For if there is so much significance in the heavens which cannot be comprehended by observation of the constellations, that, in the case of twins, an inheritance may fall to the one and not to the other, why, in the case of others who are not twins, do they dare, having examined their constellations, to declare such things as pertain to that secret which no one can comprehend, and to attribute them to the precise moment of the birth of each individual? Now, if such predictions in connection with the natal hours of others who are not twins are to be vindicated on the ground that they are founded on the observation of more extended spaces in the heavens, whilst those very small moments of time which separated the births of twins, and correspond to minute portions of celestial space, are to be connected with trifling things about which the mathematicians are not wont to be consulted,—for who would consult them as to when he is to sit, when to walk abroad, when and on what he is to dine?—how can we be justified in so speaking, when we can point out such manifold diversity both in the habits, doings, and destinies of twins?

      4. Concerning the twins Esau and Jacob, who were very unlike each other both in their character and actions.

      In the time of the ancient fathers, to speak concerning illustrious persons, there were born two twin brothers, the one so immediately after the other, that the first took hold of the heel of the second. So great a difference existed in their lives and manners, so great a dissimilarity in their actions, so great a difference in their parents' love for them respectively, that the very contrast between them produced even a mutual hostile antipathy. Do we mean, when we say that they were so unlike each other, that when the one was walking the other was sitting, when the one was sleeping the other was waking,—which differences are such as are attributed to those minute portions of space which cannot be appreciated by those who note down the position of the stars which exists at the moment of one's birth, in order that the mathematicians may be consulted concerning it? One of these twins was for a long time a hired servant; the other never served. One of them was beloved by his mother; the other was not so. One of them lost that honour which was so much valued among their people; the other obtained it. And what shall we say of their wives, their children, and their possessions? How different they were in respect to all these! If, therefore, such things as these are connected with those minute intervals of time which elapse between the births of twins, and are not to be attributed to the constellations, wherefore are they predicted in the case of others from the examination of their constellations? And if, on the other hand, these things are said to be predicted, because they are connected, not with minute and inappreciable moments, but with intervals of time which can be observed and noted down, what purpose is that potter's wheel to serve in this matter, except it be to whirl round men who have hearts of clay, in order that they may be prevented from detecting the emptiness of the talk of the mathematicians?

      5. In what manner the mathematicians are convicted of professing a vain science.

      Do not those very persons whom the medical sagacity of Hippocrates led him to suspect to be twins, because their disease was observed by him to develope to its crisis and to subside again in the same time in each of them,—do not these, I say, serve as a sufficient refutation of those who wish to attribute to the influence of the stars that which was owing to a similarity of bodily constitution? For wherefore were they both sick of

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