23 One of the salient features of the modern world is the growing interdependence of men one on the other, a development promoted chiefly by modern technical advances. Nevertheless brotherly dialogue among men does not reach its perfection on the level of technical progress, but on the deeper level of interpersonal relationships. These demand a mutual respect for the full spiritual dignity of the person. Christian revelation contributes greatly to the promotion of this communion between persons, and at the same time leads us to a deeper understanding of the laws of social life which the Creator has written into man's moral and spiritual nature. Since rather recent documents of the Church's teaching authority have dealt at considerable length with Christian doctrine about human society, this council is merely going to call to mind some of the more basic truths, treating their foundations under the light of revelation. Then it will dwell more at length on certain of their implications having special significance for our day.
Source: Gaudium et Spes (Vatican.va)