He has shown you, O mortal, what is good.
And what does the Lord require of you?
To act justly and to love mercy
and to walk humbly with your God.
Micah 6.8 NIV
We are not supposed, with the greatest respect to the theologians, to be able to work it all out. Psalm 131 is closer, "O LORD, my heart is not lifted up, my eyes are not raised too high; I do not occupy myself with things too great and too marvellous for me." (v.1)
Mercy is not an easy word to to pin down. It is in the very heart and essence of God, his steadfast love and his faithfulness. As we pray for his mercy, in solidarity, identification, with all that has been made, all our lovely and broken sisters and brothers, human and otherwise, we become through our prayer a part of this everlasting verb that is our Christ...
Lord Jesus Christ, Son of God, have mercy on me, a sinner...