A. Because the concord and union resulting from the love of the married, establish in the heart of the family a multitude of habits useful to its prosperity and preservation. The united pair are attached to, and seldom quit their home; they superintend each particular direction of it; they attend to the education of their children; they maintain the respect and fidelity of domestics; they prevent all disorder and dissipation; and from the whole of their good conduct, they live in ease and consideration; while married persons who do not love one another, fill their house with quarrels and troubles, create dissension between their children and the servants, leaving both indiscriminately to all kinds of vicious habits; every one in turn spoils, robs, and plunders the house; the revenues are absorbed without profit; debts accumulate; the married pair avoid each other, or contend in lawsuits; and the whole family falls into disorder, ruin, disgrace and want. Q. Is adultery an offence in the law of nature? A. Yes; for it is attended with a number of habits injurious to the married and to their families. The wife or husband, whose affections are estranged, neglect their house, avoid it, and deprive it, as much as they can, of its revenues or income, to expend them with the object of their affections; hence arise quarrels, scandal, lawsuits, the neglect of their children and servants, and at last the plundering and ruin of the whole family; without reckoning that the adulterous woman commits a most grievous theft, in giving to her husband heirs of foreign blood, who deprive his real children of their legitimate portion. Q. What is filial love? A. It is, on the side of children, the practice of those actions useful to themselves and to their parents. Q. How does the law of nature prescribe filial love? A. By three principal motives: 1. By sentiment; for the affectionate care of parents inspires, from the most tender age, mild habits of attachment. 2. By justice; for children owe to their parents a return and indemnity for the cares, and even for the expenses, they have caused them. 3. By personal interest; for, if they use them ill, they give to their own children examples of revolt and ingratitude, which authorize them, at a future day, to behave to themselves in a similar manner. Q. Are we to understand by filial love a passive and blind submission? A. No; but a reasonable submission, founded on the knowledge of the mutual rights and duties of parents and children; rights and duties, without the observance of which their mutual conduct is nothing but disorder. Q. Why is fraternal love a virtue?