Suppose the man he has wronged, pursuing him with a heart full of vengeance, gets him at last in his power, but at the same time finds out that he has forgotten, and can't be made to remember, the act he desires to punish him for." "It would be very vexatious," said Henry..
"Wouldn't it, though?
I can imagine the pursuer, the avenger, if a really virulent fellow, actually weeping tears of despite as he stands before his victim and marks the utter unconsciousness of any offence with which his eyes meet his own.

Such a look would blunt the very stiletto of a Corsican.

What sweetness would there be in vengeance if the avenger, as he plunged the dagger in his victim's bosom, might not hiss in his ear, 'Remember!' As well find satisfaction in torturing an idiot or mutilating a corpse.

I am not talking now of brutish fellows, who would kick a stock or stone which they stumbled over, but of men intelligent enough to understand what vengeance is." "But don't you fancy the avenger, in the case you supposed, would retain some bitterness towards his enemy, even though he had forgotten the offence ?" "I fancy he would always feel a certain cold dislike and aversion for him," replied the doctor--"an aversion such as one has for an object or an animal associated with some painful experience; but any active animosity would be a moral impossibility, if he were quite certain that there was absolutely no guilty consciousness on the other's part.
"But scarcely any application of the process gives me so much pleasure to dream about as its use to make forgiving possible, full, free, perfect, joyous forgiving, in cases where otherwise, however good our intentions, it is impossible, simply because we cannot forget.

Because they cannot forget, friends must part from friends who have wronged them, even though they do from their hearts wish them well.