Assurance: Overcoming the Difficulty of Knowing Forgiveness by John Owen and published by Christian Focus Publications.
How can I be sure that God has forgiven me? In this volume, essentially an exposition of Psalm 130, John Owen pinpoints the causes of such spiritual distress, not merely with the clinical skill of a spiritual diagnostician, but also with the understanding of someone who had profound experience of those 'depths'. And Owen does not stop with diagnosis. He maps out a biblical path of faith and obedience for distressed believers who long to say with full assurance, 'God has forgiven me.'