James 2:13 (NASB) For judgment will be merciless to one who has shown no mercy; mercy triumphs over judgment.
We do pray for mercy; /And that same prayer doth teach us all to render / The deeds of mercy. -- William Shakespeare (1564-1616)
Edythe Draper, Draper's Book of Quotations for the Christian World, (Wheaton, IL: Tyndale House Publishers, 1992), WORDsearch CROSS e-book, Under: "Mercy".