Have enough faith, dear reader, to believe that you need mercy. Mercy is not for those who think they have merited it. Such people seek justice, not mercy. Only the guilty need and seek mercy. Believe that God delights in mercy, delights to give grace where it cannot be deserved, delights to forgive where there is no reason for forgiveness but His own goodness. Believe also that the Lord Jesus Christ is the incarnation of mercy. His very existence is mercy to you. His every word means mercy. His life, His death, His intercession in heaven, all mean mercy, mercy, mercy, nothing but mercy.... He is the Savior for you.
- Charles Spurgeon, Spurgeon on Prayer and Spiritual Warfare
And a great song for you... "Mercy" by Jonathan Bulter