5. We note that Sacred Scripture and Tradition properly call angels those pure spirits who in the fundamental test of freedom have chosen God, his glory and his kingdom. They are united with God through the consuming love that flows from the blissful, face-to-face vision of the Holy Trinity. Jesus himself says: "The angels in heaven always see the face of my Father who is in heaven" (Mt 18:10). That "always seeing the face of the Father" is the highest manifestation of the worship of God. It can be said that it constitutes that "heavenly liturgy", performed on behalf of the whole universe, with which the Church's earthly liturgy is unceasingly associated, especially in its culminating moments. Suffice it to recall here the act by which the Church, every day and every hour, throughout the world, before beginning the Eucharistic prayer at the heart of Holy Mass, calls upon "the angels and archangels" to sing the glory of God thrice holy, thus uniting herself to those first worshippers of God, in worship and in loving knowledge of the ineffable mystery of his holiness.
6. Again according to revelation, the angels, who participate in the life of the Trinity in the light of glory, are also called to have their part in history in the salvation of mankind, at the moments established by the design of divine providence. "Are they not all spirits entrusted with a ministry sent to serve those who are to come into the possession of salvation?", asks the author of the Letter to the Hebrews (Heb 1:14). And this is what the Church believes and teaches, on the basis of Holy Scripture from which we learn that the task of the good angels is the protection of men and concern for their salvation. We find these expressions in various passages of Holy Scripture, for example in Psalm 90 already quoted several times: "He shall give command to his angels to guard thee in all thy ways. On their hands they will carry thee, that thou stumble not in the stone thy foot" (Psalm 90: 11-12). Jesus himself, speaking of the children and warning them not to give them scandal, refers to "their angels" (Mt 18:10); he also attributes to the angels the function of witnesses in the supreme divine judgement on the fate of those who have recognised or denied Christ: "Whoever acknowledges me before men, the Son of man will also acknowledge him before the angels of God; but whoever denies me before men will be denied before the angels of God" (Lk 12:8-9). These words are significant because if the angels take part in God's judgement, they are interested in man's life. Interest and participation that seem to receive an accentuation in the eschatological discourse, in which Jesus makes the angels intervene in the parousia, that is, in the definitive coming of Christ at the end of history (cf. Mt 24:31; 25:31. 41).
[Pope John Paul II, General Audience 6 August 1986]
