Magnifica Humanitas §49

⁴⁹ If the mystery of God as Love is the source of Social Doctrine, we see its most concrete expression in the face of Jesus Christ, the Incarnate Word. By becoming man, the Son of God enters our history and takes on human flesh, bringing with him the love that unites him to the Father and the Holy Spirit. In him, “the mystery of humanity truly becomes clear” because his humanity is completely free, open to others, capable of building healthy and beautiful relationships and committed to the total gift of self. Those who believe in him are engaged in the great work of renewal that began with the mystery of his passion, death and resurrection, and they cooperate in building up the Kingdom of God, learning to embrace all men and women as brothers and sisters, children of one Father. In this way, both the proclamation of the Gospel and Christian life, guided by the action of the Holy Spirit, tend to bring about social consequences in the world.