One who deceives will always find those who allow themselves to be deceived.

When every province of the world so teems with inhabitants that they can neither subsist where they are nor remove themselves elsewhere.

You must never believe that the enemy does not know how to conduct his own affairs. Indeed, if you want to be deceived less and want to bear less danger, the more the enemy is weak or the less the enemy is cautious, so much more must you esteem him.

Therefore, a prudent ruler ought not to keep faith when by so doing it would be against his interest, and when the reasons which made him bind himself no longer exist. If men were all good, this precept would not be a good one; but as they are bad, and would not observe their faith with you, so you are not bound to keep faith with them.

Men ought either to be indulged or utterly destroyed, for if you merely offend them they take vengeance, but if you injure them greatly they are unable to retaliate, so that the injury done to a man ought to be such that vengeance cannot be feared.

Of mankind we may say in general they are fickle, hypocritical, and greedy of gain.

One never finds anything perfectly pure and ... exempt from danger.