It is very well known that pretence by married couples producing an appearance of love and friendship, an image of truly conjugial feelings, is for the sake of babies and children. The couple's shared love for their children causes each partner to look kindly and favourably on the other. A mother's love for her babies and children and a father's love for them are linked, as the heart and the lungs are linked in the chest. The mother's love for them is like the heart, and the father's love towards them is like the lungs in the body. The reason why they can be compared is that the heart corresponds to love and the lungs to intellect; and love in the case of the mother comes from the will, in the case of the father from the intellect. In the case of spiritual people this love leads to linking in marriage as the result of justice and judgment. We say, as the result of justice, because it is the mother who carried them in the womb, bore them in pain, and then with untiring care suckles them, feeds them, washes and clothes them, and brings them up.