King David is known as a man after God’s heart. This title becomes evident when you read the Psalms and consider the honest and passionate poetic language David uses to talk about his Heavenly Father. The great philosopher Socrates famously said, “Know thyself,” and King David arguably knew himself better than any person who has ever lived. David understood the corruption of his heart and gave us profound insight into the true nature of sin in the Psalms. As a young king, David’s lust and greed consumed him, leading to his sexual desire for Bathsheba and the murder of her husband, Uriah. In Psalm 51, David laments his great sins of adultery and murder, pleading with his Heavenly Father to cleanse and wash him from the person he had become.

David makes a surprising statement in Psalm 51:4 when he says, “Against you, you only, have I sinned.” Did David not sin against Uriah by having him killed? What about Bathsheba and his lustful actions, which led to bringing her to his palace so he could sleep with her? Did David not sin against his entire army by orchestrating the death of one of their faithful and dedicated leaders? And finally, what about David’s family, who had to live with the consequences of his betrayal, adultery, and murder? What is behind David’s statement that his sin was only against God?

David is not claiming in this Psalm that he has not wronged Bathsheba, Uriah, his army, or his family. Rather, he understands that his sin is more than just the act of adultery or murder; his sin is a form of what R.C. Sproul refers to as “cosmic treason.” This is the truth about all sin. There is a sin behind the sin that we often ignore as we focus instead on specific behaviors to avoid. R.C. Sproul explains it this way in The Holiness of God:

“What are we saying to our Creator when we disobey Him at the slightest point? We are saying no to the righteousness of God. We are saying, ‘God, Your law is not good. My judgment is better than Yours. Your authority does not apply to me. I am above and beyond Your jurisdiction. I have the right to do what I want to do, not what You command me to do.’”

Sin is also a rejection of the goodness of God. When we sin, we may not consciously recognize this, but in reality, that is exactly what we are doing. God’s goodness, when properly understood, provides all our needs and fulfills the deepest longings of our hearts. When we sin, we fail to trust His goodness and instead put our trust in the created (ourselves) rather than the Creator.

The beautiful language of Psalm 51 highlights the importance of true repentance rather than self-centered remorse for sin. The language of remorse often sounds like this: “I was a fool. How could I have done this? What kind of idiot was I? It’s going to get out everywhere. I’ve undermined my family. I’ve undermined my authority as a king. I’ve hurt everyone. I’ve involved Joab in my conspiracy. How could I have done this? What a mess I’ve made.” Tim Keller describes this kind of remorse as “just an aggravated form of self-pity.” At its root, remorse is self-centeredness, which is ironically the same attitude that drives us away from trusting the goodness of God.

But repentance is different. When we truly repent, we recognize that the main issue is not the mess we’ve created or even the specific sinful acts we’ve committed. The main issue is our rejection of the goodness of God. As Tim Keller puts it:

“When you begin to repent for the real sin, the rejection of God's goodness, you stop looking in and you start to look out.”

True repentance can only happen when we understand the nature of sin and its effects on us. Without grasping the sin behind the sin, we cannot truly repent. In Scripture, repentance means to change one’s mind. God doesn’t merely want us to modify our behavior; He wants to transform our hearts. This is why David pleads with God in Psalm 51:10 to create in him a clean heart. Repentance involves viewing our lives and decisions as reflections of our commitment to our Heavenly Father. This type of repentance led David not into despair but into singing of God’s righteousness and declaring His praise (Psalm 51:14-15).

What if we could consider the sin behind the sin before we make our choices? Is that even possible? Centuries before David rejected God’s goodness by succumbing to the lust of his flesh with Bathsheba, another man after God’s heart faced a similar temptation. Genesis 39 recounts how a young man named Joseph was continuously begged by his master’s wife to have sex with her. In Genesis 39:9, Joseph makes it clear why he refuses: “How could I do such a wicked thing and sin against God?” Joseph, though a slave, understood that his actions would reflect his trust in the goodness and faithfulness of God, even when it seemed that God had abandoned him to slavery. His embrace of the vertical nature of his actions set the stage for him to resist sin. Would we be willing to embrace this same perspective and ask the rhetorical question Joseph asked: “How could I do such a wicked thing and sin against God?”

While David understood the nature of his sin and the sin behind it, he also embraced the God who could deliver him from it. Repentance, then, is not simply about changing our minds regarding sin but also about treasuring and worshiping the God who saves us from it. David pointed to a God who is able to forgive, but we, through the message of the Gospel, know Jesus, whose final sacrifice cleanses and washes us whiter than snow. David asks God in Psalm 51:9 to hide His face from his sins. Tim Keller captures the beauty of this truth when he says:

“On the cross, God hid His face from His Son so He could hide His face from our sins.”

May we never forget this truth.