[23] For they are sojourners from the fact of their passing their time among citizens; but from the fact of their not being settled inhabitants, they also resemble foreigners. In the same manner, according to my idea, as adopted children, inasmuch as they inherit the property of those who have adopted them, resemble real legitimate children; but inasmuch as they were not begotten by them, they resemble strangers. The same relation, then, that a mistress has to her handmaidens, or a wife, who is a citizen, to a concubine, that same relation has virtue, that is Sarah, to education, that is Hagar. So that very naturally, since the husband, by name Abraham, is one who has an admiration for contemplation and knowledge; virtue, that is Sarah, would be his wife, and Hagar, that is all kinds of encyclical accomplishment, would be his concubine.