The author uses the example of Commodus to show how a prince's cruelty, lack of dignity, and failure to manage the military lead to contempt and eventual assassination.
CHAPTER XX. ARE FORTRESSES, AND MANY OTHER THINGS TO WHICH PRINCES OFTEN RESORT, ADVANTAGEOUS OR HURTFUL?

The author explains that a new prince must carefully choose which historical figures to imitate based on his specific circumstances, rather than following any one model blindly. He suggests that the qualities needed to found a state are different from those required to maintain one that is already stable.

The author posits that arming one's subjects is a strategic necessity for new princes, as it transforms distrusted individuals into loyal adherents and defenders.

The author suggests that wise princes should strategically foster opposition or animosity to provide themselves with the opportunity to overcome it and gain renown.

A warning is issued that princes should be wary of those who helped them gain power out of discontent, as they are harder to satisfy than former enemies.