We have often heard the advice, "Forgive and Forget." The ACIM tells us that in order to have a miracle we have to first forgive to rid ourselves of misperceptions about others. As we rid ourselves of our misperceptions and misbeliefs, we start to see the miracle of healing to the degree that we can forget the entire error (there are no "sins" rather there are errors that are corrected), because everyone is atoned. When we see the miracle heal our vision, we are grateful and joyousness prevails because all are made wholesome again.
This may be difficult for a person under stress to see, but great mental vision can take place while reading sacred books.