Catechism of the Catholic Church §1733 — excerpt
The more one does what is good, the freer one becomes. There is no true freedom except in the service of what is good and just.
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.