Catechism of the Catholic Church §2654 — excerpt
The spiritual writers, paraphrasing Matthew 7:7, summarize in this way the dispositions of the heart nourished by the word of God in prayer "Seek in reading and you will find in meditating; knock in mental prayer and it will be opened to you by contemplation."
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: Guigo the Carthusian, Scala Paradisi: PL 40, 998