What Do We Do About What We Have Done

Many times before the Believer came to God and accepted his son Jesus Christ as his Lord and Savior, we did things that made no kind of sound reason.We may have stolen things, lied about things, trick someone for no good reason. I am sure many can add to this list. But after we come to the Lord we no longer desire to do evil in any way. But some times those thoughts of the things that we did come up in our own minds. What do we do? Do we repent again, do we rebuke thses thoughts, or do we go back to God about it? Some times it is because the flesh is trying to give a reason for us not to forgive ourselves. But I am looking at David and his children manily today Tamar and Amnon. 2nd Samuel 13. Do you believe you reap what you sow? So Amnon reaped what he had sown. Did his father David have anything to do with what he reaped or sowed?