Catechism of the Catholic Church §558 — excerpt
Jesus recalls the martyrdom of the prophets who had been put to death in Jerusalem. Nevertheless he persists in calling Jerusalem to gather around him: "How often would I have gathered your children together as a hen gathers her brood under her wings, and you would not!"
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.