Chapter 11 — Part I: The Creed — Article IX: The Holy Catholic Church; the Communion of Saints
Section 59. Meaning of "The Communion of Saints" — The faithful, therefore, in the first place are to be informed that this part of the Article, is, as it were, a sort of explanation of the preceding part which regards the unity, sanctity and catholicity of the Church. For the unity of the Spirit, by which she is governed, brings it about that whatsoever has been given to the Church is held as a common possession by all her members.