Max Lucado writes:

Confession does for the soul what preparing the land does for the field. Before the farmer sows the seed, he works the acreage, removing the rocks and pulling the stumps. He knows that seed grows better if the land is prepared. Confession is the act of inviting God to walk the acreage of our hearts. "There is a rock of greed over here, Father; I can't budge it. And that tree of guilt near the fence? Its roots are long and deep. And may I show you some dry soil, too crusty for seed?" God's seed grows better if the soil of the heart is cleared.