What is the origin of the idiom "forgive and forget" and when to use it?

The idiom "forgive and forget" has been used since the late 18th century and is rooted in the idea of letting go of past grievances or offenses. It emphasizes the importance of both pardoning someone for their wrongdoings and choosing not to dwell on or hold grudges about those past actions. This expression is often employed to advise or encourage forgiveness in situations where someone has been wronged. It suggests that instead of harboring resentment or seeking revenge, it' is better to forgive the wrongdoer and move forward without dwelling on their act.