Chapter 11 — Part I — Article IX (Of the Church)
Section 263. Q. What means of communion has the Church on earth with the Church in heaven? A. The prayer of faith and love. The faithful who belong to the Church militant upon earth, in offering their prayers to God, call at the same time to their aid the saints who belong to the Church in heaven; and these, standing on the highest steps of approach to God, by their prayers and intercessions purify, strengthen, and offer before God the prayers of the faithful living upon earth, and by the will of God work graciously and beneficently upon them, either by invisible virtue, or by distinct apparitions, and in divers other ways.