I would suggest that this is not exclusive to Christians. I have had a lot of people who are not Christians tell me to forgive and forget, to move on, to just get over it. They just do not understand. They, people without PTSD, don't realize that we have lost a part of ourselves.In my experience a lot of Christians do not understand PTSD
I will sometimes tell them, to put it into perspective, to give this same advice to someone who has lost a limb. A person who has lost a limb has certain limitations. Now they can overcome it with a lot of therapy, and retraining, but they cannot just forget it and pretend that they still have that limb. they will always have limitations.
A person with PTSD is the same way, we have limitations. Now with a lot of therapy and retraining we can overcome it, but we can never just forget it, and pretend we don't have it. We will always have certain limitations.