Therefore justice, whose only possible mode of proceeding is to punish in present time for what is done in past time, must always punish a person more or less similar to, but never identical with, the one who committed the offence, and therein must be no justice.
"Why, sir, it is no theory of mine, but the testimony of universal consciousness, if you interrogate it aright, that the difference between the past and present selves of the same individual is so great as to make them different persons for all moral purposes.

That single fact we were just speaking of--the fact that no man would care for vengeance on one who had injured him, provided he knew that all memory of the offence had been blotted utterly from his enemy's mind--proves the entire proposition.

It shows that it is not the present self of his enemy that the avenger is angry with at all, but the past self.

Even in the blindness of his wrath he intuitively recognizes the distinction between the two.

He only hates the present man, and seeks vengeance on him in so far as he thinks that he exults in remembering the injury his past self did, or, if he does not exult, that he insults and humiliates him by the bare fact of remembering it.