The Root of Sin vs. its symptoms
From Tony Reinke at the Desiring God blog, quoting Rick Gamache's sermon “Whiter Than Snow”:
"I think it is absolutely amazing and very telling, given what we know about the situation, that David never mentions sexual sin in Psalm 51. He’s not mainly praying that the Lord would provide him with good accountability. He’s not mainly praying that God would give him self-control and protect his eyes and his mind. Those are all good things. But David does not mention them here because his sexual sin — and every sexual sin — is the symptom of the disease not the disease. Sexual sin is a symptom of lack of fullness of joy and gladness in Jesus. It’s a symptom of a lack of being ravished by the love and kindness and mercy and goodness and beauty and excellence and majesty and glory and honor and power of God.
"And so David confesses."