In "The Cask of Amontillado," what is the meaning of the phrase "A wrong is unredressed when retribution overtakes its redresser"?

In Poe's
classic short story ", Montresor is the unreliable narrator andwho is obsessed with seeking
revenge on his enemy, Fortunato. Before Montresor elaborates on his brilliant plan to get
revenge, he expounds upon his strict definition of revenge. Montresor begins by stating that one
must not only punish their enemy but do so with impunity. In other words, Montresor believes
that it is necessary to not get caught while taking revenge. Montresor goes on to say:

A wrong is unredressed when retribution overtakes its redresser (Poe
1)

The word unredressed means "not set right"
or "unfixed" while retribution is a punishment inflicted upon someone as vengeance.
Therefore, Montresor is saying that a wrong will not be fixed or set right if punishment
overtakes the person seeking revenge (redresser). This is another way of saying that one must
avenge their enemy with impunity and avoid being punished for their actions. Essentially,
Montresor is adamant about not being caught, arrested, or punished for getting
revenge.

He feels that in order to get revenge one must maintain their wits
and focus by concealing their intentions and carefully executing a foolproof plan, which is
exactly what he does. For the remainder of the narrative, Montresor describes how he cleverly
manipulated Fortunato into following him into the depths of his catacombs, where he proceeded to
bury him alive. Montresor ends up getting away with his crime, which proves that he followed his
own advice regarding vengeance.