Chapter 11 — Part I: The Creed — Article IX: The Holy Catholic Church; the Communion of Saints
Section 36. Unity In Spirit, Hope And Faith — Moreover, the Apostle, writing to the Corinthians, tells them that there is but one and the same Spirit who imparts grace to the faithful, as the soul communicates life to the members of the body. Exhorting the Ephesians to preserve this unity, he says: Be careful to keep the unity of the Spirit in the bond of peace; one body and one Spirit. As the human body consists of many members, animated by one soul, which gives sight to the eves, hearing to the ears, and to the other senses the power of discharging their respective functions; so the mystical body of Christ, which is the Church, is composed of many faithful. The hope, to which we are called, is also one, as the Apostle tells us in the same place; for we all hope for the same consummation, eternal and happy life. Finally, the faith which all are bound to believe and to profess is one: Let there be no schisms amongst you, says the Apostle. And Baptism, which is the seal of our Christian faith, is also one.