People motivated by shame are not capable of truly forgiving other people even though they may outwardly appear to forgive wrongs committed against them.
I was taught to forgive because it is the Christian and moral thing to do. But forgiveness motivated by a sense obligation, that forgiveness is the right thing to do and withholding forgiveness would induce guilty feelings is not true forgiveness. It is shame.
In order to truly forgive I must first feel my anger for being wronged. When this happens I must also feel entitled to my anger. I must appreciate and acknowledge the wrong committed against me. If I do not do this any pretense at forgiveness is a farce.
If I am motivated by shame I will not allow myself to acknowledge the wrongs committed against me because I do not feel entitled to my anger. I will act like I forgive readily out of a false sense of morality. I will say I forgive because I want people to like me and think that I am moral and kind.
But when I do not allow myself to feel anger it stays inside and comes out in passive aggressive forms. When I do not allow myself to feel anger there is nothing to forgive really. Perhaps it is more accurate to say that if I do not feel my anger and feel entitled to it, I am not in a position to forgive. I have no standing.
Only when I properly feel my anger for being wronged am I in position to choose to forgive. It has to be a real choice and not one I feel obligated to make. If I forgive out a sense of obligation then I am not the one offering forgiveness. In that situation, whoever imposed the obligation upon me is the one responsible for forgiveness. But forgiveness is personal and cannot be given through proxy. So really, no forgiveness is given at all.
In Roman Catholicism, the sacrament of Reconciliation is performed by a priest acting in the name of God. This is forgiveness by proxy. I am tempted to say that because this is forgiveness by proxy it is therefore not authentic. But I believe something else is at work in this sacrament. Sometimes a feeling of shame is so intense that forgiveness for the sin requiring reconciliation is required. When a person seeks forgiveness of sins through Reconciliation I think he is really thinking of a way to forgive himself for whatever transgression he committed. The shame he has felt for the sins he committed is punishment enough. The anger he has vented on himself has been fully felt only there has been no release because it is directed towards himself. In this instance an outside entity may be required to release him.
Of course self-forgiveness is possible without the sacrament. Like all religious practices they are merely tools we use to relate with the grand, infinite, unknowable universe that exists both inside and outside ourselves.