The Symposium (Banquet of the Ten Virgins)

For truly by a great stretch of power the plant of virginity was sent down to men from heaven, and for this reason it was not revealed to the first generations. For the race of mankind was still very small in number; and it was necessary that it should first be increased in number, and then brought to perfection. Therefore the men of old times thought it nothing unseemly to take their own sisters for wives, until the law coming separated them, and by forbidding that which at first had seemed to be right, declared it to be a sin, calling him cursed who should “uncover the nakedness” of his sister; God thus mercifully bringing to our race the needful help in due season, as parents do to their children. For they do not at once set masters over them, but allow them, during the period of childhood, to amuse themselves like young animals, and first send them to teachers stammering like themselves, until they cast off the youthful wool of the mind, and go onwards to the practice of greater things, and from thence again to that of greater still. And thus we must consider that the God and Father of all acted towards our forefathers. For the world, while still unfilled with men, was like a child, and it was necessary that it should first be filled with these, and so grow to manhood. But when hereafter it was colonized from end to end, the race of man spreading to a boundless extent, God no longer allowed man to remain in the same ways, considering how they might now proceed from one point to another, and advance nearer to heaven, until, having attained to the very greatest and most exalted lesson of virginity, they should reach to perfection; that first they should abandon the intermarriage of brothers and sisters, and marry wives from other families; and then that they should no longer have many wives, like brute beasts, as though born for the mere propagation of the species; and then that they should not be adulterers; and then again that they should go on to continence, and from continence to virginity, when, having trained themselves to despise the flesh, they sail fearlessly into the peaceful haven of immortality.