son; and I know why you say this: it is because in the discussion yesterday on natural causes, you showed that some malignant power, transferring itself into the order of the stars, excites the lusts of men, provoking them in various ways to sin, yet not compelling or producing sins." To this I answered: "It is well that you remember it; and yet, though you do remember it, you have fallen into error." Then said my father: "Pardon me, my son; for I have not yet much practice in these things: for indeed your discourses yesterday, by their truth, shut me up to agree with you; yet in my consciousness there are, as it were, some remains of fevers, which for a little hold me back from faith, as from health. For I am distracted, because I know that many things, yea, almost all things, have befallen me according to genesis."
Chap. xi.—Test of astrology.
Then I answered: "I shall therefore tell you, my father, what is the nature of mathematics, and do you act according to what I tell you. Go to a mathematician, and tell him first that such and such evils have befallen you at such a time, and that you wish to learn of him whence, or how, or through what stars they have befallen you. He will no doubt answer you that a malignant Mars or Saturn has ruled your times, or that some one of them has been periodic; or that some one has regarded you diametrically, or in conjunction, or centrally; or some such answer will he give, adding that in all these some one was not in harmony with the malignant one, or was invisible, or was in the figure, or was beyond the division, or was eclipsed, or was hot in contact, or was among the dark stars; and many other like things will he answer, according to his own reasons, and will condescend upon particulars. After him go to another mathematician, and tell him the opposite, that such and such good happened to you at that time, mentioning to him the same time, and ask him from what parts of your genesis this good has come to you, and take care, as I said, that the times are the same with those about which you asked concerning evils. And when you have deceived him concerning the times, see what figures
