Create in me a clean heart, O God, and renew a right spirit within me. Cast me not away from your presence, and take not your Holy Spirit from me. Restore to me the joy of your salvation, and uphold me with a willing spirit. (Psalm 51:10-12 ESV)
Guilt, shame, and cover-ups are what weigh the sinner down. Jesus wants us to be free from all of that because so much of our time is wasted over them. It makes sense that death is the sole penalty for sin because it is like an infectious disease that spreads from one person to another. It needs to be eradicated from our minds and hearts if we are to experience the freedom that only Christ can give us.
Would our work be much more enjoyable if we did not have to worry about paying our bills? How would you feel knowing that your mortgage and credit debts have all been paid off? Would the weight of the world be lifted off your shoulders? Imagine what you could do with all your earnings!
Having a clean heart is what mattered to King David, not money, because he desired to be close to God. He understood that sin is what causes him to drift away, and he certainly did not enjoy being spiritually distant.
The joy he experienced while being with God was probably indescribable and incredibly satisfying. From his words, it sounded like he was in a constant pursuit of the Lord and the joy that came along with that. Having a clean heart freed him from bearing the guilt of his sins, something that material wealth could never buy down or erase. He knew that there was a greater life and a greater destination ahead of him. Therefore, he worked hard to remove the clutter in his heart as he walked with God. In Christ, fears are replaced with love because he forgave all our debt and secured a place for us in heaven.