Catechism of St Pius X - The Ninth Article of the Creed, The Communion of Saints

The Communion of Saints 

1 Q. What are we taught by these words of the Ninth Article: The Communion of Saints?

A. In the words The Communion of Saints, the Ninth Article of the Creed teaches us that the Church's spiritual goods, both internal and external, are common to all her members because of the intimate union that exists between them.

 2 Q. Which are the internal goods that are common in the Church?

A. The internal goods that are common in the Church are: the graces received through the Sacraments; faith, hope and charity; the infinite merits of Jesus Christ; the superabundant merits of the Blessed Virgin and of the Saints; and the fruit of all the good works done in the same Church.

3 Q. Which are the external goods that are common in the Church?

A. The external goods that are common in the Church are: the Sacraments, the Sacrifice of the Mass, public prayers, religious functions, and all the other outward practices that unite the faithful.

4 Q. Do all the children of the Church share in this communion of goods?

A. All Christians who are in the grace of God share in the communion of internal goods, while those who are in mortal sin do not participate in these goods.

5 Q. Why do not those who are in mortal sin participate in these goods?

A. Because that which unites the faithful with God, and with Jesus Christ as His living members, rendering them capable of performing meritorious works for life eternal, is the grace of God which is the supernatural life of the soul; and hence as those who are in mortal sin are without the grace of God, they are excluded from perfect communion in spiritual goods, nor can they accomplish works meritorious towards life eternal.

6 Q. Do Christians then, who are in mortal sin derive no advantage from the internal and spiritual goods of the Church?

A. Christians who are in mortal sin still continue to derive some advantage from the internal and spiritual goods of the Church, inasmuch as they still preserve the Christian character which is indelible, and the virtue of faith which is the basis of justification. They are aided, too, by the prayers and good works of the faithful towards obtaining the grace of conversion to God.

7 Q. Can those in mortal sin participate in the external goods of the Church?

A. Those in mortal sin can participate in the external goods of the Church, unless indeed they are cut off from the Church by excommunication.

8 Q. Why are the members of this Communion, taken together, called saints?

A. The members of this Communion are called saints because all are called to sanctity and have been sanctified by baptism, and because many of them have really attained perfect sanctity.

9 Q. Does the Communion of Saints extend also to heaven and purgatory?

A. Yes, the Communion of Saints also extends to heaven and purgatory, because charity unites the three Churches — the Triumphant, the Suffering and the Militant; the Saints pray to God both for us and for the souls in purgatory; while we on our part give honour and glory to the Saints, and are able to relieve the suffering souls in purgatory by applying on their behalf indulgences and other good works.

(Tomorrow, The Ninth Article of the Creed, Those Outside the Communion of Saints)

Pius X, Pope St.. Catholic Catechism of Saint Pius X (1908) (pp. 35-37). Kindle Edition.