The Catechism…
675 Before Christ’s second coming the Church must pass through a final trial that will shake the faith of many believers.
574 The persecution that accompanies her pilgrimage on earth575 will unveil the “mystery of iniquity” in the form of a religious deception offering men an apparent solution to their problems at the price of apostasy from the truth. The supreme religious deception is that of the Antichrist, a pseudo-messianism by which man glorifies himself in place of God and of his Messiah come in the flesh.576
676 The Antichrist’s deception already begins to take shape in the world every time the claim is made to realize within history that messianic hope which can only be realized beyond history through the eschatalogical judgment. The Church has rejected even modified forms of this falsification of the kingdom to come under the name of millenarianism,
577 especially the “intrinsically perverse” political form of a secular messianism.
578
677 The Church will enter the glory of the kingdom only through this final Passover, when she will follow her Lord in his death and Resurrection.
579 The kingdom will be fulfilled, then, not by a historic triumph of the Church through a progressive ascendancy, but only by God’s victory over the final unleashing of evil, which will cause his Bride to come down from heaven.
580 God’s triumph over the revolt of evil will take the form of the Last Judgment after the final cosmic upheaval of this passing world.
581
and…
1186 Finally, the church has an eschatological significance. To enter into the house of God, we must cross a
threshold, which symbolizes passing from the world wounded by sin to the world of the new Life to which all men are called. The visible church is a symbol of the Father’s house toward which the People of God is journeying and where the Father "will wipe every tear from their eyes."
65 Also for this reason, the Church is the house of
all God’s children, open and welcoming.
and…
2771 In the Eucharist, the Lord’s Prayer also reveals the
eschatological character of its petitions. It is the proper prayer of “the end-time,” the time of salvation that began with the outpouring of the Holy Spirit and will be fulfilled with the Lord’s return. The petitions addressed to our Father, as distinct from the prayers of the old covenant, rely on the mystery of salvation already accomplished, once for all, in Christ crucified and risen.
and…
2771 In the Eucharist, the Lord’s Prayer also reveals the
eschatological character of its petitions. It is the proper prayer of “the end-time,” the time of salvation that began with the outpouring of the Holy Spirit and will be fulfilled with the Lord’s return. The petitions addressed to our Father, as distinct from the prayers of the old covenant, rely on the mystery of salvation already accomplished, once for all, in Christ crucified and risen.
Bottom line, we do not know when the last day is coming, so be prepared…
Subrosa