The Church in celebrating the Eucharistic Sacrifice is very aware of doing so in union with the heavenly host. One Eucharistic Prayer after another confesses: “In union with the whole Church we honor Mary, the ever-virgin Mother of Jesus Christ our Lord and God. Then the following are named: Saint Joseph, the Apostles, the Martyrs, the confessors, the virgins, and all the saints…The angels are given special mention in the preface…these references to the angels are only natural, as the cry of “Holy, Holy, Holy” that we make our own immediately afterward is attributed by Scripture to them. The Church suffering in purgatory is not forgotten. The Eucharistic Sacrifice is also offered for the faithful departed who “have died in Christ but are not yet wholly purified.” [Council of Trent] It follows therefore that at the Mass ‘our union with the Church in heaven is put into effect in the noblest manner when with common rejoicing we celebrate together the praise of the divine Majesty.
Francis Cardinal Arinze: Celebrating the Holy Eucharistpp. 26-27