by deeds the bad impression which he had formed of them; and thus the prince always extracts more profit from them than from those who, serving him in too much security, may neglect his affairs. And since the matter demands it, I must not fail to warn a prince, who by means of secret favours has acquired a new state, that he must well consider the reasons which induced those to favour him who did so; and if it be not a natural affection towards him, but only discontent with their government, then he will only keep them friendly with great trouble and difficulty, for it will be impossible to satisfy them. And weighing well the reasons for this in those examples which can be taken from ancient and modern affairs, we shall find that it is easier for the prince to make friends of those men who were contented under the former government, and are therefore his enemies, than of those who, being discontented with it, were favourable to him and encouraged him to seize it.
6. It has been a custom with princes, in order to hold their states more securely, to build fortresses that may serve as a bridle and bit to those who might design to work against them, and as a place of refuge from a first attack. I praise this system because it has been made use of formerly. Notwithstanding that, Messer Nicolo Vitelli in our times has been seen to demolish
