Catechism of the Catholic Church §953 — excerpt
Communion in charity. In the sanctorum communio, "None of us lives to himself, and none of us dies to himself." "If one member suffers, all suffer together; if one member is honored, all rejoice together.
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.