539. There are two duties that we are obliged to perform after we have examined ourselves: prayer and confession. The prayer is to be a request that [the Lord] have mercy on us, give us the power to resist the evils that we have repented of, and provide us an inclination and desire to do what is good, since "without him we cannot do anything" (John 15:5). The confession is to be that we see, recognize, and admit to our evils and that we are discovering that we are miserable sinners.
There is no need for us to list our sins before the Lord and no need to beg that he forgive them. The reason we do not need to list our sins before the Lord is that we searched them out within ourselves and saw them, and therefore they are present before the Lord because they are present before us. The Lord was leading us in our self-examination; he disclosed our sins; he inspired our grief and, along with it, the motivation to stop doing them and to begin a new life.
[2] There are two reasons why we should not beg the Lord to forgive our sins. The first is that sins are not abolished, they are just relocated within us. They are laid aside when after repentance we stop doing them and start a new life. This is because there are countless yearnings that stick to each evil in a kind of cluster; these cannot be set aside in a moment, but they can be dealt with in stages as we allow ourselves to be reformed and regenerated.
The second reason is that the Lord is mercy itself. Therefore he forgives the sins of all people. He blames no one for any sin. He says, "They do not know what they are doing" [Luke 23:34] (but this does not mean our sins are taken away altogether). To Peter, who was asking how many times he should forgive a friend who was sinning against him - whether he should give forgiveness as many as seven times - the Lord answered, "I do not say as many as seven times, but as many as seventy times seven" (Matthew 18:21-22). How forgiving, then, is the Lord?
It does no harm, though, for people who are weighed down by a heavy conscience to lighten their load by listing their sins before a minister of the church, for the sake of absolution. Doing so introduces them to the habit of examining themselves and reflecting on their daily evils. Nevertheless, this type of confession is earthly in nature, whereas the confession described above is spiritual.