Catechism of the Catholic Church §1740 — excerpt
Threats to freedom. the exercise of freedom does not imply a right to say or do everything. It is false to maintain that man, "the subject of this freedom," is "an individual who is fully self-sufficient and whose finality is the satisfaction of his own interests in the enjoyment of earthly goods."
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: CDF, instruction, Libertatis conscientia 13