(Phil 3, 20) Our citizenship is in heaven
[20] But our citizenship is in heaven, and from it we also await a savior, the Lord Jesus Christ.
(CCC 1003) United with Christ by Baptism, believers already truly participate in the heavenly life of the risen Christ, but this life remains "hidden with Christ in God" (Col 3:3; cf. Phil 3:20). The Father has already "raised us up with him, and made us sit with him in the heavenly places in Christ Jesus"(Eph 2:6). Nourished with his body in the Eucharist, we already belong to the Body of Christ. When we rise on the last day we "also will appear with him in glory" (Col 3:4). (CCC 2796) When the Church prays "our Father who art in heaven," she is professing that we are the People of God, already seated "with him in the heavenly places in Christ Jesus" and "hidden with Christ in God" (Eph 2:6; Col 3:3); yet at the same time, "here indeed we groan, and long to put on our heavenly dwelling" (2 Cor 5:2; cf. Phil 3:20; Heb 13:14). [Christians] are in the flesh, but do not live according to the flesh. They spend their lives on earth, but are citizens of heaven (Ad Diognetum 5: PG 2, 1173). (CCC 999) How? Christ is raised with his own body: "See my hands and my feet, that it is I myself" (Lk 24:39); but he did not return to an earthly life. So, in him, "all of them will rise again with their own bodies which they now bear," but Christ "will change our lowly body to be like his glorious body," into a "spiritual body" (Lateran Council IV (1215): DS 801; Phil 3:21; 2 Cor 15:44): But someone will ask, "How are the dead raised? With what kind of body do they come?" You foolish man! What you sow does not come to life unless it dies. And what you sow is not the body which is to be, but a bare kernel.... What is sown is perishable, what is raised is imperishable.... The dead will be raised imperishable... For this perishable nature must put on the imperishable, and this mortal nature must put on immortality (1 Cor 15:35-37, 42, 52, 53).
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