174. 16. A husband has duties appropriate to him, and a wife duties appropriate to her, and a wife cannot enter into duties appropriate to her husband or a husband into duties appropriate to his wife and perform them properly. There is no need to illustrate by recounting them that there are duties appropriate to a husband and duties appropriate to a wife, for these are many and various in nature. Moreover, everyone knows how to divide them into their categories according to their general and specific kinds, provided he directs his mind to seeing the difference between them. Duties by which wives especially unite themselves with their husbands are duties involved in the upbringing of little children of both sexes, and of girls to the age when they are given in marriage.