Catechism of the Catholic Church §2825 — excerpt
"Although he was a Son, [Jesus] learned obedience through what he suffered." How much more reason have we sinful creatures to learn obedience - we who in him have become children of adoption.
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: Origen, De orat. 26 PG 11, 501B · St. John Chrysostom, Hom. in Mt. 19, 5 PG 57, 280