In Psalm 102 David pours out his heart in anguish, sick and fearful for his life–but in Psalm 103 David praises God for all of the benefits to his soul. He has been healed from his sickness, with his youth renewed. The LORD, he says, is compassionate and gracious, slow to anger, abounding in love. …He does not treat us as our sins deserve or repay us according to our iniquities. (103:8, 10)
David would never forget the love and mercy extended to him by his compassionate Heavenly Father. He praises God that “as far as the east is from the west, so far has he removed our transgressions from us.” (103:12)
Let this be written for a future generation, that a people not yet created may praise the LORD: Psalm 102:18 NIV