Big Question and Oedipus Rex

Oedipus Rex is revolved largely around one prophecy and how that prophecy is upheld. It becomes clear during the play that Oedipus has indeed fulfilled what the prophecy foretold, and focus changes to how characters will react to the uncovering of this truth. Do they forgive, forget, ignore, punish? Oedipus originally blasphemes the killer of the king and promises his punishment, evidently not one to forgive. When he learns that he is the killer, forgiveness isn't even considered. Oedipus presumes himself damned and hastily gouges out his eyes. Had he known forgiveness and been able to forgive himself, a happy ending might be possible.


How important is the power to forgive? Is it essential, or meaningless, or even impossible at times?