Catechism of the Catholic Church §53 — excerpt
The divine plan of Revelation is realized simultaneously "by deeds and words which are intrinsically bound up with each other" and shed light on each another.
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: DV 2 · St. Irenaeus, Adv. haeres. 3, 20, 2: PG 7/1, 944 · 3, 17, 1 · 4, 12, 4 · 4, 21, 3