Catechism of the Catholic Church §845 — excerpt
To reunite all his children, scattered and led astray by sin, the Father willed to call the whole of humanity together into his Son's Church.
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: St. Augustine, Serm. 96, 7, 9: PL 38, 588 · St. Ambrose, De virg. 18, 118: PL 16, 297B