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Replying to JehovahsWitness in post #1178]
Yes. So first from the catechism.
II. "THY KINGDOM COME"
2816 In the New Testament, the word basileia can be translated by "kingship" (abstract noun), "kingdom" (concrete noun) or "reign" (action noun).
The Kingdom of God lies ahead of us. It is brought near in the Word incarnate, it is proclaimed throughout the whole Gospel, and it has come in Christ's death and Resurrection. T
he Kingdom of God has been coming since the Last Supper and,
in the Eucharist, it is in our midst. The kingdom will come in glory when Christ hands it over to his Father:
It may even be . . .
that the Kingdom of God means Christ himself, whom we daily desire to come, and whose coming we wish to be manifested quickly to us. For as he is our resurrection, since in him we rise, so he can also be understood as the Kingdom of God, for in him we shall reign.86
2817 This petition is "Marana tha," the cry of the Spirit and the Bride: "Come, Lord Jesus."
Even if it had not been prescribed to pray for the coming of the kingdom, we would willingly have brought forth this speech, eager to embrace our hope. In indignation the souls of the martyrs under the altar cry out to the Lord: "O Sovereign Lord, holy and true, how long before you judge and avenge our blood on those who dwell upon the earth?" For their retribution is ordained for the end of the world. Indeed as soon as possible, Lord, may your kingdom come!87
2818 In the Lord's Prayer, "thy kingdom come" refers primarily to the final coming of the reign of God through Christ's return.88 But, far from distracting the Church from her mission in this present world, this desire commits her to it all the more strongly. Since Pentecost, the coming of that Reign is the work of the Spirit of the Lord who "complete[s] his work on earth and brings us the fullness of grace."89
2819
"The kingdom of God [is] righteousness and peace and joy in the Holy Spirit."90 The end-time in which we live is the age of the outpouring of the Spirit. Ever since Pentecost, a decisive battle has been joined between "the flesh" and the Spirit.91
Only a pure soul can boldly say: "Thy kingdom come." One who has heard Paul say, "Let not sin therefore reign in your mortal bodies," and has purified himself in action, thought and word will say to God: "Thy kingdom come!"92
"The kingdom of God is at hand"
541 "Now after John was arrested, Jesus came into Galilee, preaching the gospel of God, and saying: 'The time is fulfilled, and the kingdom of God is at hand: repent, and believe in the gospel.'"246 "To carry out the will of the
Father Christ inaugurated the kingdom of heaven on earth."247 Now the Father's will is "to raise up
men to share in his own divine life".248 He does this by gathering men around his Son Jesus Christ. This gathering is
the Church, "on earth the seed and beginning of that kingdom".249
763 ... To fulfill the Father's will,
Christ ushered in the Kingdom of heaven on earth.
The Church "is the Reign of Christ already present in mystery."162
764 "This Kingdom shines out before men in the word, in the works and in the presence of Christ."163
To welcome Jesus' word is to welcome "the Kingdom itself."164 The seed and beginning of the Kingdom are the "little flock" of those whom Jesus came to gather around him, the flock whose shepherd he is.165 They form Jesus' true family.166 To those whom he thus gathered around him, he taught a new "way of acting" and a prayer of their own.167
765 The Lord Jesus endowed his community with a structure that will remain until the Kingdom is fully achieved.
865 The Church is ultimately one, holy, catholic, and apostolic in her deepest and ultimate identity,
because it is in her that "the Kingdom of heaven," the "Reign of God,"380 already exists and will be fulfilled at the end of time.
The kingdom has come in the person of Christ and grows mysteriously in the hearts of those incorporated into him, until its full eschatological manifestation.
Then from Pope Benedict XVI - Jesus of Nazareth
THE CHRISTOLOGICAL DIMENSION
Here we see that “the Kingdom is not a thing, it is not a geographical dominion like worldly kingdoms. It is a person; it is he. On this interpretation, the term ‘Kingdom of God’ is itself a veiled Christology. By the way in which he speaks of the Kingdom of God, Jesus leads men to realize the overwhelming fact that in him God himself is present among them, that he is God’s presence.” (Pope Benedict, Jesus of Nazareth, Part 1)
THE IDEALISTIC/MYSTICAL DIMENSION
Here we see that The Kingdom of God resides in the heart of man. Church Father, Origen [1] wrote, “those who pray for the coming of the Kingdom of God pray without any doubt for the Kingdom of God that they contain in themselves, and they pray that this kingdom might bear fruit and attain its fullness.”
THE ECCLESIASTICAL DIMENSION
Here we see that the kingdom of God is in the here and now, present in and through the Church. Yet it is a mixed reality that will only be perfectly realized at the end of history. This current “mixed” state can be seen as the Church on earth which now grows in the field of the world with both weeds and wheat until the harvest when Christ says he will “tell the reapers, Gather the weeds first and bind them in bundles to be burned. But gather the wheat into my barn” (Matt 13:30).
So it is from the whole doctrine that we see the kingdom of heaven, kingdom of God is a state of being because only a state of being explains everything the kingdom of God is said to be.
And the kingdom of heaven or kingdom of God is heaven itself of course, which the catechism says.
1024 “This perfect life with the Most Holy Trinity—this communion of life and love with the Trinity, with the Virgin Mary, the angels and all the blessed—is called ‘heaven.’ Heaven is the ultimate end and fulfillment of the deepest human longings,
the state of supreme, definitive happiness.”