Catechism of the Catholic Church §1720 — excerpt
The New Testament uses several expressions to characterize the beatitude to which God calls man: - the coming of the Kingdom of God; - the vision of God: "Blessed are the pure in heart, for they shall see God" - entering into the joy of the Lord; - entering into God's rest:
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.
Whole chapters cited: 1 John 2
Also cites: St. Augustine, De civ. Dei 22, 30, 5: PL 41,804