Catechism of the Catholic Church §795 — excerpt
Christ and his Church thus together make up the "whole Christ" (Christus totus). the Church is one with Christ. the saints are acutely aware of this unity:
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: St. Augustine, In Jo. ev, 21, 8: PL 35, 1568 · Pope St. Gregory the Great Moralia in Job, praef., 14: PL 75, 525A · St. Thomas Aquinas, STh III, 48, 2 · Acts of the Trial of Joan of Arc