Cowardice is impotence worse than violence. The coward desires revenge but being afraid to die, he looks to others, maybe to the government of the day, to do the work of defense for him. A coward is less than a man. He does not deserve to be a member of a society of men and women.
A wrong is unredressed when retribution overtakes its redresser. It is equally unredressed when the avenger fails to make himself felt as such to him who has done the wrong.
Revenge in the hands of your enemies is a loaded gun. You can beg them for mercy, wave the white flag of surrender, but the only true elixir for the vitriol they bestow is a measure of hatred dispensed of your own.
Getting inside the mind of a terrorist wasn't difficult at all. Even as children, human beings fabricate elaborate revenge fantasies. We're not a particular species. Check out popular video games.
But in Republics there is a stronger vitality, a fiercer hatred, a keener thirst for revenge. The memory of their former freedom will not let them rest; so that the safest course is either to destroy them, or to go and live in them.
There must be what Mr. Gladstone many years ago called a blessed act of oblivion. We must all turn our backs upon the horrors of the past. We must look to the future. We cannot afford to drag forward across the years that are to come the hatreds and revenges which have sprung from the injuries of the past.
A material resurrection seems strange and even absurd except for purposes of punishment, and all punishment which is to revenge rather than correct must be morally wrong, and when the World is at an end, what moral or warning purpose can eternal tortures answer?
Gentleness is the ability to bear reproaches and slights with moderation, and not to embark on revenge quickly, and not to be easily provoked to anger, but be free from bitterness and contentiousness, having tranquility and stability in the spirit.