32 As God did not create man for life in isolation, but for the formation of social unity, so also "it has pleased God to make men holy and save them not merely as individuals, without bond or link between them, but by making them into a single people, a people which acknowledges Him in truth and serves Him in holiness." So from the beginning of salvation history He has chosen men not just as individuals but as members of a certain community. Revealing His mind to them, God called these chosen ones "His people" (Ex. 3:7-12), and even made a covenant with them on Sinai. This communitarian character is developed and consummated in the work of Jesus Christ. For the very Word made flesh willed to share in the human fellowship. He was present at the wedding of Cana, visited the house of Zacchaeus, ate with publicans and sinners. He revealed the love of the Father and the sublime vocation of man in terms of the most common of social realities and by making use of the speech and the imagery of plain everyday life. Willingly obeying' the laws of his country He sanctified those human ties, especially family ones, which are the source of social structures. He chose to lead the life proper to an artisan of His time and place. In His preaching He clearly taught the sons of God to treat one another as brothers. In His prayers He pleaded that all His disciples might be "one." Indeed as the redeemer of all, He offered Himself for all even to point of death. "Greater love than this no one has, that one lay down his life for his friends" (John 15:13). He commanded His Apostles to preach to all peoples the Gospel's message that the human race was to become the Family of God, in which the fullness of the Law would be love. As the firstborn of many brethren and by the giving of His Spirit, He founded after His death and resurrection a new brotherly community composed of all those who receive Him in faith and in love. This He did through His Body, which is the Church. There everyone, as members one of the other, would render mutual service according to the different gifts bestowed on each. This solidarity must be constantly increased until that day on which it will be brought to perfection. Then, saved by grace, men will offer flawless glory to God as a family beloved of God and of Christ their Brother.
Source: Gaudium et Spes (Vatican.va)