“Forgive, but never forget.”

In the scope that it was given, I agree. I also believe in most cases, forgetting is a large part of forgiving. History and science here answers the non-forgetting portion of the quote. By example; forgiving socialists for their atrocities enhances the individual's humanity - BUT NEVER, forget the horrors of applied socialism.

Right, Mike.  Just as I can forgive a wild animal for trying to bite me (without feeling the need to kill it to prevent future attempts), I will remain ever vigilant, knowing it is simply acting according to its natural instincts.  Same thing for social democrats and communists...

Forgive, and remember the lessons learned from our disputes, as to prevent the return of those disputes.