Catechism of the Catholic Church §708 — excerpt
This divine pedagogy appears especially in the gift of the Law. God gave the letter of the Law as a "pedagogue" to lead his people towards Christ.
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: Exodus 19 · Exodus 20 · Deuteronomy 1 · Deuteronomy 2 · Deuteronomy 3 · Deuteronomy 4 · Deuteronomy 5 · Deuteronomy 6 · Deuteronomy 7 · Deuteronomy 8 · Deuteronomy 9 · Deuteronomy 10 · Deuteronomy 29 · Deuteronomy 30