and the motions of the spheres, so we understand also the equity of some of His laws; that which is unknown to us of both of them is far more than that which is known to us. I will now return to the theme of the present chapter.
The law about forbidden sexual intercourse seeks in all its parts to inculcate the lesson that we ought to limit sexual intercourse altogether, hold it in contempt, and only desire it very rarely. The prohibition of pederasty (Lev. xviii. 22) and carnal intercourse with beasts (ibid. 73) is very clear. If in the natural way the act is too base to be performed except when needed, how much more base is it if performed in an unnatural manner, and only for the sake of pleasure.
The female relatives whom a man may not marry are alike in this respect--that as a rule they are constantly together with him in his house: they would easily listen to him, and do what he desires; they are near at hand, and he would have no difficulty in procuring them. No judge could blame him if found in their company. If to these relatives the same law applied as to all other unmarried women, if we were allowed to marry any of them, and were only precluded from sexual intercourse with them without marriage, most people would constantly have become guilty of misconduct with them. But as they are entirely forbidden to us, and sexual intercourse with them is most emphatically denounced unto us as a capital crime, or a sin punishable with extinction (karet), and as there is no means of ever legalizing such intercourse, there is reason to expect that people will not seek it, and win not think of it. That the persons included in that prohibition are, as we have stated, at hand and easily accessible, is evident. For as a rule, the mother of the wife, the grandmother, the daughter, the granddaughter, and the sister-in-law, are mostly with her; the husband meets them always when he goes out, when he comes in, and when he is at his work. The wife stays also frequently in the house of her husband's brother, father, or son. It is also well known that we are often in the company of our sisters, our aunts, and the wife of our uncle, and are frequently brought up together with them. These are all the relatives which we must not marry. This is one of the reasons why intermarriage with a near relative is forbidden. But according to my opinion the prohibition serves another object, namely, to inculcate chastity into our hearts. Licence between the root and the branch, between a man and his mother, or his daughter, is outrageous. The intercourse between root and branch is forbidden, and it makes no difference whether the male element is the root or the branch, or both root and branch combine in the intercourse with a third person, so that the same individual cohabits with the root and with the branch. On this account it is prohibited to marry a woman and her mother, the wife of the father or of the son; for in all these cases there is the intercourse between one and the same person on the one side and root and branch on the other.
The law concerning brothers is like the law concerning root and branch. The sister is forbidden, and so is also the sister of the wife and the wife of the brother; because in the latter cases two persons who are considered like root and branch, cohabit with the same person. But in these prohibitions brothers and sisters are partly considered as root and branch and partly as one body; the sister of the mother is therefore like the mother, and the sister