At a healing service in October 1995, he and a dozen church members were praying to her [Faustina]Get it? Its asking for a favor. Oh nevermind....
1. Christ is a unique mediator between God and man because he is the Mediator of the New Covenant (Heb. 9:15,12:24), just as Moses was the mediator (Greek mesites) of the Old Covenant (Gal. 3:19–20). The intercession of fellow Christians—which is what the saints in heaven are—also clearly does not interfere with Christ’s unique mediatorship because in the four verses immediately preceding 1 Timothy 2:5, Paul says that Christians should interceed: "First of all, then, I urge that supplications, prayers, intercessions, and thanksgivings be made for all men, for kings and all who are in high positions, that we may lead a quiet and peaceable life, godly and respectful in every way. This is good, and pleasing to God our Savior, who desires all men to be saved and to come to the knowledge of the truth" (1 Tim. 2:1–4). Clearly, then, intercessory prayers offered by Christians on behalf of others something "good and pleasing to God," not something infringing on Christ’s role as mediator.
2. The Bible directs us to invoke those in heaven and ask them to pray with us. Thus in Psalms 103, we pray, "Bless 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!" (Ps. 103:20-21). And in Psalms 148 we pray, "Praise the Lord! Praise the Lord from the heavens, praise him in the heights! Praise him, all his angels, praise him, all his host!" (Ps. 148:1-2).
Not only do those in heaven pray with us, they also pray for us. In the book of Revelation, we read: "[An] 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 rayers of the saints from the hand of the angel before God"(Rev. 8:3-4).