Humble appeal for mercy

What is the basis to appeal for Divine mercy? There are texts in the Bible where God is implored to act in the Divine nature and to honour promises to people because that is what God needs to do. The text today from the Book of Daniel in the Roman Catholic Lectionary is of this type. The people have been decimated. The appeal is made to restore the Promise made to Abraham of many descendants. The psalmist praises the mercy of God and the instruction God makes available to the humble. It is through the attitude of humility that the grace and mercy of the Divine is appreciated. Forgiveness and humility are related. We seek forgiveness out of the humility of our poor choices. We offer forgiveness as Peter discovers in the dialogue with Jesus as related by Matthew through the experience of being forgiven. Our need for forgiveness is continuous as humility reveals. Our forgiveness of others is necessarily equally gracious.