It may well be true that "Forgiveness sets you free." However, the idea of forgiveness as a psychological or emotional condition traces to 18th-century moral philosophy, not first-century Christian writings.
Forgiveness is part of our spiritual well being, but when I've talked to people who have forgiven powerful wrongs, they've pointed out that it's not always good to ask for someone's forgiveness.
I was desperate that New Year's Eve in 1983 to find shelter. I attended a service in a neighborhood church and hid in the back under a pew. I was ecstatic when the doors were locked.