Create in me a clean heart, O God; and renew a right spirit within me. -- Psalm 51:10 (KJV)
Peter told Simon to repent and to pray that the thought of his heart might be forgiven. Simon's response was to ask Peter to do the praying for him. He never put the words in his own mouth. That is where the story leaves him, and it is hard not to wonder what might have changed if he had prayed.
David prayed. An adulterer, complicit in a man's death, the anointed king of Israel, and when Nathan laid the sin in front of him, David did not spin it or shrink it. He asked God for the one thing no amount of effort was going to give him.
You Cannot Scrub This Yourself
Create in me a clean heart. That is the language of an operating table, not a self-improvement plan. David understood that regret and willpower were never going to get him clean. He asked the Maker to make again, to set a right spirit where the old one had collapsed. Simon backed away from this exact prayer. He wanted the trouble to go quiet; David wanted to be remade.
Repentance is not standing around waiting to feel something. It is choosing to step into the light and let God work while you are still raw. David did not hold off until he felt new. He prayed, and he left the cleansing to the only One who could hand it over.
Restored People Teach
Listen to David's next line. Then will I teach transgressors thy ways, and sinners shall be converted unto thee. The clean heart was not the finish. On the far side of being remade, David already saw a room full of strugglers he would finally be fit to help.
God does not put you back together only so you can feel relief. He does it so the people coming up behind you find someone who walked the road and made it home clean.
David's prayer is short, and it costs you something to mean it. Say it this morning in your own plain words, and trust the remaking to the One who has done it before. The teaching He has in mind for you starts on the other side of it.