The principle of the common good, to which every aspect of social life must be related if it is to attain its fullest meaning, stems from the dignity, unity and equality of all people. According to its primary and broadly accepted sense, the common good indicates “the sum total of social conditions which allow people, either as groups or as individuals, to reach their fulfilment more fully and more easily”.346Second Vatican Ecumenical Council, Gaudium et Spes, 26: AAS 58 (1966), 1046; cf. Catechism of the Catholic Church, 1905-1912; John XXIII, Encyclical Letter Mater et Magistra: AAS 53 (1961), 417-421; John XXIII, Encyclical Letter Pacem in Terris: AAS 55 (1963), 272-273; Paul VI, Apostolic Letter Octogesima Adveniens, 46: AAS 63 (1971), 433-435. The common good does not consist in the simple sum of the particular goods of each subject of a social entity. Belonging to everyone and to each person, it is and remains “common”, because it is indivisible and because only together is it possible to attain it, increase it and safeguard its effectiveness, with regard also to the future. Just as the moral actions of an individual are accomplished in doing what is good, so too the actions of a society attain their full stature when they bring about the common good. The common good, in fact, can be understood as the social and community dimension of the moral good.
A society that wishes and intends to remain at the service of the human being at every level is a society that has the common good — the good of all people and of the whole person 347Cf. Catechism of the Catholic Church, 1912. — as its primary goal. The human person cannot find fulfilment in himself, that is, apart from the fact that he exists “with” others and “for” others. This truth does not simply require that he live with others at various levels of social life, but that he seek unceasingly — in actual practice and not merely at the level of ideas — the good, that is, the meaning and truth, found in existing forms of social life. No expression of social life — from the family to intermediate social groups, associations, enterprises of an economic nature, cities, regions, States, up to the community of peoples and nations — can escape the issue of its own common good, in that this is a constitutive element of its significance and the authentic reason for its very existence348Cf. John XXIII, Encyclical Letter Pacem in Terris: AAS 55 (1963), 272..