Let's notice that our prayers are a little like photos to God. Now when He had taken the scroll, the four living creatures and the twenty-four elders fell down before the Lamb, each having a harp, and golden bowls full of incense, which are the prayers of the saints. Then another angel, having a golden censer, came and stood at the altar. He was given much incense, that he should offer it with the prayers of all the saints upon the golden altar which was before the throne. And the smoke of the incense, with the prayers of the saints, ascended before God from the angel's hand.
Incense is like a perfume.
Perhaps there is a difference of scent in a prayer of repentance and a prayer of mercy. I am sure God enjoys reading the names of his friends, Abraham and Sarah. And David, a man after God's own heart. I know that God is looking forward to the resurrection when He can see and talk to the saints. We typically think that in the Old Testament the people had only physical promises.