When you give up vengeance, ...

When you give up vengeance, make sure you are not giving up on justice. The line between the two is faint, unsteady, and fine...Vengeance is our own pleasure of seeing someone who hurt us getting it back and then some. Justice, on the other hand, is secure when someone pays a fair penalty for wronging another even if the injured person takes no pleasure in the transaction. Vengeance is personal satisfaction. Justice is moral accounting...Human forgiveness does not do away with human justice.
 Lewis B. Smedes

Quotes from the same author

The difference between guilt and shame is very clear--in theory. We feel guilty for what we do. We feel shame for what we are. A person feels guilt because he did something wrong. A person feels shame because he is something wrong. We may feel guilty because we lied to our mother. We may feel shame because we are not the person our mother wanted us to be.
 Lewis B. Smedes
Some people ask who they are and expect their feelings to tell them. But feelings are flickering flames that fade after every fitful stimulus. Some people ask who they are and expect their achievements to tell them. But the things we accomplish always leave a core of character unrevealed. Some people ask who they are and expect visions of their ideal self to tell them. But our visions can only tell us what we want to be, not what we are
 Lewis B. Smedes
Their pain [the injurer's pain at having injured you] and your pain create the point and counterpoint for the rhythm of reconciliation. When the beat of their pain is a response to the beat of yours, they have become truthful in their feelings...they have moved a step closer to a truthful reunion.
 Lewis B. Smedes
...Forgiving is not having to understand. Understanding may come later, in fragments, an insight here and a glimpse there, after forgiving.
 Lewis B. Smedes
Kindness is the power that moves us to support and heal someone who offers nothing in return.
 Lewis B. Smedes