Sacred Scripture tells us that we when come before God in prayer and worship, we “draw near to Mount Zion and the city of the living God, the heavenly Jerusalem, to myriads to angels in festal gathering, to the assembly of the first-born enrolled in heaven, to God the judge of all, to the spirits of just men made perfect, to Jesus, the mediator of a new covenant, and to the sprinkled blood which speaks more eloquently that that of Abel.” (Hebrews 12:22-24).
Mount Zion, the heavenly Jerusalem, is the metaphor for the communion of saints in heaven. When we approach God, through Jesus Christ, we no longer “draw near to an untouchable mountain” (Heb. 12:18). We are in communion with our Lord, his angels, and all those “spirits of just men made perfect.” This is how we, as Catholics, understand our prayer to the angels and saints. It is communion through Jesus Christ. It is communication. It is fellowship.
We believe the angels and saints hear us, too, as we read St. John’s Revelation. He tells us that in his vision he sees “the Lamb” and with the Lamb are “four living creatures and the twenty-four elders [who] fall down before the Lamb.” (Rev. 5:6-8). The Lamb is Christ, of course. The twenty-four elders are by all scholarly accounts representative of the 12 tribes of Israel and the 12 apostles of Jesus. In this same vision, St. John describes the scene: “Along with their harps, the elders were holding vessels of gold filled with aromatic spices, which were the prayers of God’s holy people” (Rev. 5:8).
According to St. John, those in the heavenly communion are glorifying God and offering to him “the prayers of God’s holy people.” This is, in part, how we understand the intercession of the saints and angels. They offer, on our behalf, prayers as offerings before the Lord.
So, how do we know their prayers are effective?
St. James tells us “the fervent prayer of a holy man is powerful” (James 5:16). We know that those in the heavenly communion of saints have been “made perfect” and are thus “holy.” We know that when we come before the Lord, we are also drawing near to them. We know that they are in heaven offering prayers on our behalf. So, we conclude, through the teaching of the Church that when we pray to Mary, the saints, and angels that they, according to Divine Providence, are given fellowship with us through Jesus Christ and that their prayers are powerful.