A bad effect upon the relations of men and women has been produced by the romantic movement, through directing attention to what ought to be an incidental good, not the purpose for which relations exist. Love is what gives intrinsic value to a marriage, and, like art and thought, it is one of the supreme things which make human life worth preserving. But though there is no good marriage without love, the best marriages have a purpose which goes beyond love. The love of two people for each other is too circumscribed, too separate from the community, to be by itself the main purpose of a good life. It is not in itself a sufficient source of activities, it is not sufficiently prospective, to make an existence in which ultimate satisfaction can be found. It brings its great moments, and then its times which are less great, which are unsatisfying because they are less great. It becomes, sooner or later, retrospective, a tomb of dead joys, not a well-spring of new life. This evil is inseparable from any purpose which is to be achieved in a single supreme emotion. The only adequate purposes are those which stretch out into the future, which can never be fully achieved, but are always growing, and infinite with the infinity of human endeavor. And it is only when love is linked to some infinite purpose of this kind that it can have the seriousness and depth of which it is capable. For the great majority of men and women seriousness in sex relations is most likely to be achieved through children. Children are to most people rather a need than a desire: instinct is as a rule only consciously directed towards what used to lead to children. The desire for children is apt to develop in middle life, when the adventure of one’s own existence is past, when the friendships of youth seem less important than they once did, when the prospect of a lonely old age begins to terrify, and the feeling of having no share in the future becomes oppressive. Then those who, while they were young, have had no sense that children would be a fulfilment of their needs, begin to regret their former contempt for the normal, and to envy acquaintances whom before they had thought humdrum. But owing to economic causes it is often impossible for the young, and especially for the best of the young, to have children without sacrificing things of vital importance to their own lives. And so youth passes, and the need is felt too late.