Catechism of the Catholic Church §544 — excerpt
The kingdom belongs to the poor and lowly, which means those who have accepted it with humble hearts. Jesus is sent to "preach good news to the poor"; he declares them blessed, for "theirs is 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.