In this reverent and searching devotional, Andrew Murray unfolds the meaning of God's mercy as revealed in Psalm 51. Rather than treating repentance as a momentary act, Murray presents it as a divine work within the heart, producing true brokenness, cleansing, and renewal. Have Mercy Upon Me examines how God uses conviction of sin not to drive the believer away, but to draw the soul into deeper dependence upon His grace. Murray emphasizes that forgiveness alone is not the end-God desires truth in the inward parts and a heart fully surrendered to His sanctifying work. This book explores:The spiritual meaning of God's mercy Why brokenness is essential to true repentance The inner cleansing God desires, not merely outward reform The joy and restoration that follow surrender to God Written with humility, clarity, and deep biblical insight, this work is ideal for personal devotion, prayerful reading, and seasons of self-examination. Recommended for readers of classic Christian devotionals, holiness writings, and works on repentance and spiritual renewal. (Originally published as Have Mercy Upon Me)