Catechism of the Catholic Church §1716 — excerpt
The Beatitudes are at the heart of Jesus' preaching. They take up the promises made to the chosen people since Abraham. the Beatitudes fulfill the promises by ordering them no longer merely to the possession of a territory, but to the Kingdom of heaven:
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.