Second, forgiveness is not forgetting. Forgetting is a passive process in which a matter fades from memory merely with the passing of time. Forgiving is an active process; it involves a conscious choice and a deliberate course of action. To put it another way, when God says that he "remembers your sins no more" (Isa. 43:25), he is not saying that he cannot remember our sins. Rather, he is promising that he will not remember them. When he forgives us, he chooses not to mention, recount, or think about our sins ever again. Similarly, when we forgive, we must draw on God's grace and consciously decide not to think or talk about what others have done to hurt us. This may require a lot of effort, especially when an offense is still fresh in mind. Fortunately, when we decide to forgive someone and stop dwelling on an offense, painful memories usually begin to fade.
Finally, forgiveness is not excusing. Excusing says, "That's okay," and implies, "What you did wasn't really wrong," or "You couldn't help it." Forgiveness is the opposite of excusing. The very fact that forgiveness is needed and granted indicates that what someone did was wrong and inexcusable. Forgiveness says, "We both know that what you did was wrong and without excuse. But since God has forgiven me, I forgive you." Because forgiveness deals honestly with sin, it brings a freedom that no amount of excusing could ever hope to provide.
by Ken Sande, Updated Edition (Grand Rapids, Baker Books, 2003) p. 206-207.
Food for Thought