Catechism of the Catholic Church §2207 — excerpt
The family is the original cell of social life. It is the natural society in which husband and wife are called to give themselves in love and in the gift of life.
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.