Consequently it does not at all appear whether he who is named as the son was himself the first begotten. Nay, since it is incredible that those fathers were either so long in attaining puberty, or could not get wives, or could not impregnate them, it is also incredible that those sons were their firstborn. But as the writer of the sacred history designed to descend by well-marked intervals through a series of generations to the birth and life of Noah, in whose time the flood occurred, he mentioned not those sons who were first begotten, but those by whom the succession was handed down.
Let me make this clearer by here inserting an example, in regard to which no one can have any doubt that what I am asserting is true. The evangelist Matthew, where he designs to commit to our memories the generation of the Lord’s flesh by a series of parents, beginning from Abraham and intending to reach David, says, “Abraham begat Isaac”;812 why did he not say Ishmael, whom he first begat? Then “Isaac begat Jacob”; why did he not say Esau, who was the firstborn? Simply because these sons would not have helped him to reach David. Then follows, “And Jacob begat Judah and his brethren”: was Judah the first begotten? “Judah,” he says, “begat Pharez and Zara”; yet neither were these twins the firstborn of Judah, but before them he had begotten three other sons. And so in the order of the generations he retained those by whom he might reach David, so as to proceed onwards to the end he had in view. And from this we may understand that the antediluvians who are mentioned were not the firstborn, but those through whom the order of the succeeding generations might be carried on to the patriarch Noah. We need not, therefore, weary ourselves with discussing the needless and obscure question as to their lateness of reaching puberty.
XVI
Of marriage between blood-relations, in regard to which the present law could not bind the men of the earliest ages.
As, therefore, the human race, subsequently to the first marriage of the man who was made of dust, and his wife who was made out of his side, required the union of males and females in order that it might multiply, and as there were no human beings except those who had been born of these two, men took their sisters for wives—an act which was as certainly dictated by necessity in these ancient days as afterwards it was condemned by the prohibitions of religion. For it is very reasonable and just that men, among whom concord is honourable and useful, should be bound together by various relationships; and that one man should not himself sustain many relationships, but that the various relationships should be distributed among several, and should thus serve to bind together the greatest number in the same social interests. “Father” and “father-in-law” are the names of two relationships. When, therefore, a man has one person for his father, another for his father-in-law, friendship extends itself to a larger number. But Adam in his single person was obliged to hold both relations to his sons and daughters, for brothers and sisters were united in marriage. So too Eve his wife was both mother and mother-in-law to her children of both sexes; while, had there been two women, one the mother, the other the mother-in-law, the family affection would have had a wider field. Then the sister herself by becoming a wife sustained in her single person two relationships, which, had they been distributed among individuals, one being sister, and another being wife, the family tie would have
