242. Thus that marriage should only be lawful with one wife, that it should be for life, that it should be terminable by the infidelity of either husband or wife, are rules of right; not of morality, as such, but of right. Without such rules the rights of the married persons are not maintained. Those outward conditions of family life would not be secured to them, which are necessary on the whole for the development of a free morality. Polygamy is a violation of the rights, (1) of those who through it are indirectly excluded from regular marriage, and thus from the moral education which results from this; (2) of the wife, who is morally lowered by exclusion from her proper position in the household and by being used, more or less, as the mere instrument of the husband's pleasure; (3) of the children, who lose the chance of that full moral training which depends on the connected action of father and mother. The terminability of marriage at the pleasure of one of the parties to it (of its terminability at the desire of both we will speak presently) is a violation of the rights at any rate of the unconsenting party, on the grounds _(a)_ that liability to it tends to prevent marriage from becoming that 'individua vitae consuetudo' which gives it its moral value, and _(b)_ that, when the marriage is dissolved, the woman, just in proportion to her capacity for self-devotion and the degree to which she has devoted herself to her original husband, is debarred from forming that 'individua vitae consuetudo' again, and thus crippled in her moral possibilities. It is a violation of the rights of children for the same reason for which polygamy is so.