how should evil and wickedness be carried out?

"Cruelty can be considered well-used if carried out in one stab, the wicked deeds executed all at once, and if it can be interpreted as necessary for self-preservation. This distinction leads Machiavelli to the following argument: “We may add this note that when a prince takes a new state, he should calculate the sum of all the injuries he will have to do, and do them all at once, so as not to have to do new ones every day; simply by not repeating them, he will then be able to reassure people, and win them over to his side with benefits.”