47 The well-being of the individual person and of human and Christian society is intimately linked with the healthy condition of that community produced by marriage and family. Hence Christians and all men who hold this community in high esteem sincerely rejoice in the various ways by which men today find help in fostering this community of love and perfecting its life, and by which parents are assisted in their lofty calling. Those who rejoice in such aids look for additional benefits from them and labor to bring them about. Yet the excellence of this institution is not everywhere reflected with equal brilliance, since polygamy, the plague of divorce, so-called free love and other disfigurements have an obscuring effect. In addition, married love is too often profaned by excessive self-love, the worship of pleasure and illicit practices against human generation. Moreover, serious disturbances are caused in families by modern economic conditions, by influences at once social and psychological, and by the demands of civil society. Finally, in certain parts of the world problems resulting from population growth are generating concern. All these situations have produced anxiety of consciences. Yet, the power and strength of the institution of marriage and family can also be seen in the fact that time and again, despite the difficulties produced, the profound changes in modern society reveal the true character of this institution in one way or another. Therefore, by presenting certain key points of Church doctrine in a clearer light, this sacred synod wishes to offer guidance and support to those Christians and other men who are trying to preserve the holiness and to foster the natural dignity of the married state and its superlative value.
Source: Gaudium et Spes (Vatican.va)