Besides what has been said, people are fickle by nature; and it is a simple to convince them of something but difficult to hold them in that conviction; and, therefore, affairs should be managed in such a way that when they no longer believe, they can be made to believe by force.
Niccolo MachiavelliThe princes who have done great things are the ones who have taken little account of their promises.
Niccolo MachiavelliAny harm you do to a man should be done in such a way that you need not fear his revenge.
Niccolo Machiavelli