The Romans never allowed a trouble spot to remain simply to avoid going to war over it, because they knew that wars don't just go away, they are only postponed to someone else's advantage. Therefore, they made war with Philip and Antiochus in Greece, in order not to have to fight them in Italy... They never went by that saying which you constantly hear from the wiseacres of our day, that time heals all things. They trusted rather their own character and prudence- knowing perfectly well that time contains the seeds of all things, good as well as bad.
The prince who relies upon their words, without having otherwise provided for his security, is ruined; for friendships that are won by awards, and not by greatness and nobility of soul, although deserved, yet are not real, and cannot be depended upon in time of adversity.
A prince need trouble little about conspiracies when the people are well disposed, but when they are hostile and hold him in hatred, then he must fear everything and everybody.
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.
By the delusions of seeming good the people are often misled to desire their own ruin; and they are frequently influenced by great hopes and brave promises.
A prince must not have any objective nor any thought, nor take up any art, other than the art of war and its ordering and discipline; because it is the only art that pertains to him who commands. And it is of such virtue that not only does it maintain those who were born princes, but many times makes men rise to that rank from private station.
Hence it happened that all the armed prophets conquered, all the unarmed perished.
[It., Di qui nacque che tutti li profeti armati vincero, e li disarmati rovinarono.]