"You, Lord, are forgiving and good, abounding in love to all who call to you." (Psalm 86:5)
Psalm 86 is the only psalm in Book Three attributed to David, and it is constructed almost entirely from quotations and allusions to other psalms and passages of Scripture. The psalmist is not composing from fresh inspiration so much as weaving together the inherited prayer language of Israel into a personal petition. This is itself instructive: in times of distress, the best prayer may be the one we borrow from those who have prayed before us. The Church has always understood the liturgical and scriptural tradition as a treasury of prayer that comes to our aid when our own words fail.
The theological heart of the psalm is a fourfold description of God that the psalmist explicitly draws on as the basis of his petition: You, Lord, are forgiving and good, abounding in love to all who call to you. He is citing the divine self-description given to Moses at Sinai in Exodus 34:6-7. The character of God revealed in the covenant is the foundation of the prayer. We do not appeal to God to be better than he is. We appeal to him to be exactly who he has revealed himself to be.
Brothers and sisters, the practice of Psalm 86, weaving the inherited words of faith into personal prayer, is an ancient and fruitful one. The Rosary, the Liturgy of the Hours, the Mass itself, are all forms of praying with borrowed words. Do not be ashamed to pray the psalms as your own prayer, to mean them with your whole heart. They were given to us precisely for this.
Lord, you are forgiving and good, abounding in love to all who call on you. We call on you now from the midst of our troubles. Hear our prayer, have mercy, give us your strength, teach us your way, and let us praise you with all our heart. Through Christ our Lord. Amen.