Topic 14: The Holy Spirit and His Action in the Church
The Holy Spirit acts in the Church through the sacraments. We often say that the Holy Spirit is like the soul of the Church because He performs in it some of the functions that the soul performs in the body. He vivifies it, impels it to carry out its mission, unifies it in love. He is the interior teacher who speaks in our heart, who reveals to us the mysteries of God, who helps us discern what is pleasing to God.
Topic 15: The Church Founded by Christ
Throughout his life, Christ made clear what his Church would be like. The Church is the community of all those who have received the regenerating grace of the Spirit by which they become children of God. All the baptised share in the common priesthood; they are called to bring men and women into a relationship with God. The ecumenical movement is an ecclesial goal that seeks visible unity among Christians in the one Church founded by Christ.
Topic 16: The Hierarchical Constitution of the Church
The Church is a structured society where some have the mission to guide others. The assistance of the Holy Spirit to the whole Church so that it may not err in believing is also given to the magisterium so that it may faithfully and authentically teach the Word of God. The Church has always called only baptised men to the order of the priesthood; she has felt bound by the will of Christ, who chose only men as Apostles.
Topic 17: The Church and the World
The Church is inseparably both human and divine. It lives and acts in the world, but its goal and strength are not here on earth but in heaven. The Church seeks only the salvation of mankind, but she is also concerned with temporal affairs. Each Christian faithful participates in the mission of the Church according to his or her condition and vocation, and the gifts received.
Topic 18: The Social Doctrine of the Church
The good news of salvation requires that the Church be present in the world. The Gospel is a proclamation of the transformation of the world according to God’s plan. The Church’s social doctrine is part of social moral theology, which derives from a Christian conception of the human being and political life. The Church’s social morality teaches the primacy of spiritual and moral goods over material goods.
Topic 19: The Resurrection of the Body
The resurrected body will be real and material, but not earthly and mortal. The enigma of death can only be understood in the light of Christ’s resurrection and our own resurrection in Him. Eternal life is what gives ultimate and permanent meaning to human life, to ethical commitment, to generous dedication, to self-sacrificing service, to the effort to communicate Christ’s doctrine and love to all souls.
Topic 20: The Sacraments
The sacraments are efficacious signs of grace. Sanctifying grace is a stable and supernatural disposition that perfects the soul to make it capable of living with God. The seven sacraments correspond to all the stages and important moments of each Christian’s life: the sacraments give birth and increase, healing and mission to the Christian's life of faith. They form an ordered whole, in which the Eucharist is at the centre, since it contains the Author of the sacraments.
Topic 12: The Incarnation
Jesus is the only Son of God who became man for our salvation. He is perfect God and perfect man. He took on our material and bodily condition, subject to many needs, in order to save us from our sins. Mary is truly the Mother of God because the One she conceived as man, through the work of the Holy Spirit, is the eternal Son of the Father.