Singinbeauty:
I think that once we pass on from this earth our job is done. We are in Heaven with the Almighty God and our days are spent worshipping Him and rejoicing in our peace. I do not believe that those in Heaven or Hell can hear us or interact with us.
Fundamentalists often challenge the Catholic practice of asking saints and angels to pray on our behalf. But the Bible directs us to invoke those in heaven and ask them to pray with us.
Thus, in Psalm 103 we pray, āBless the Lord, O you his angels, you mighty ones who do his word, hearkening to the voice of his word! Bless the Lord, all his hosts, his ministers that do his will!ā (Ps. 103:20ā21). And in the opening verses of Psalms 148 we pray, āPraise the Lord! Praise the Lord from the heavens, praise him in the heights! Praise him, all his angels, praise him, all his host!ā
Not only do those in heaven pray
with us, but they also pray
for us. In the book of Revelation, John sees that āthe twenty-four elders [the leaders of the people of God in heaven] fell down before the Lamb, each holding a harp, and with golden bowls full of incense, which are the prayers of the saintsā (Rev. 5:8). Thus the saints in heaven offer to God the prayers of the people on earth.
Angels do the same thing: āAnother angel came and stood at the altar [in heaven] with a golden censer; and he was given much incense to mingle with the prayers of all the saints upon the golden altar before the throne; and the smoke of the incense rose with the prayers of the saints from the hand of the angel before Godā (Rev. 8:3ā4).
Jesus himself warned us not to offend small children, because their guardian angels have guaranteed intercessory access to the Father: āSee that you do not despise one of these little ones; for I tell you that in heaven their angels always behold the face of my Father who is in heavenā (Matt. 18:10).
Because he is the only God-Man and the Mediator of the New Covenant, Jesus is the only Mediator between man and God (cf. 1 Tim. 2:5), but this in no way means that we cannot or should not ask our fellow Christians to pray with us and for us (cf. 1 Tim. 2:1ā4). In particular, we should ask the intercession of Christians in heaven, who have already had their sanctification completed, for āthe prayer of a righteous man has great power in its effectsā (Jas. 5:16).
Catholic Answers