Never do an enemy a small injury.

People should either be caressed or crushed. If you do them minor damage they will get their revenge; but if you cripple them there is nothing they can do. If you need to injure someone, do it in such a way that you do not have to fear their vengeance.

Men ought either to be well treated or crushed, because they can avenge themselves of lighter injuries, of more serious ones they cannot; therefore the injury that is to be done to a man ought to be of such a kind that one does not stand in fear of revenge.

If an injury has to be done to a man it should be so severe that his vengeance need not be feared.

For the taking of revenge, a man locks himself up alone and thinks. His stomach must be empty for his head to be full. Vengeance comes a little from the heart and a lot from the mind; one must take oneself apart from the noise of men and of things, even from what resembles them; only the voices of bells and of thunder are allowed. Let the room in which you meditate be dark, narrow and warm.

If an injury has to be done to a man it should be so severe that his vengeance need not be feared