Roman Catechism 36.19

Chapter 36 — Part IV: Prayer — The Second Petition: Thy Kingdom Come

Section 19. The Kingdom Of Glory — By the words kingdom of God is also meant that kingdom of His glory, of which Christ our Lord says in St. Matthew: Come ye blessed of my Father, possess the kingdom which was prepared for you from the beginning of the world. This kingdom the thief, when he had admirably acknowledged his crimes, begged of Christ in the words related by St. Luke: Lord, remember me, when thou comest into thy kingdom. Of this kingdom St. John speaks when he says: Unless a man be born again of water and the Spirit, he cannot enter into the kingdom of God; and of it the Apostle says to the Ephesians: No fornicator, or unclean, or covetous person (which is a serving of idols) hath inheritance in the kingdom of Christ and of God. To it also refer some of the parables made use of by Christ the Lord when speaking of the kingdom of heaven.