Catechism of the Catholic Church §2214 — excerpt
The divine fatherhood is the source of human fatherhood; this is the foundation of the honor owed to parents. the respect of children, whether minors or adults, for their father and mother is nourished by the natural affection born of the bond uniting them.
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.
Whole chapters cited: Ephesians 314