Catechism of the Catholic Church §835 — excerpt
"Let us be very careful not to conceive of the universal Church as the simple sum, or . . the more or less anomalous federation of essentially different particular churches.
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: Paul VI, EN 62 · LG 23