The 48 Laws of Power (Robert Greene and Joost Elffers).

Collection of cynical business laws, for example:

Law 19

Know Who You’re Dealing with – Do Not Offend the Wrong Person

“There are many different kinds of people in the world, and you can never assume that everyone will react to your strategies in the same way. Deceive or outmaneuver some people and they will spend the rest of their lives seeking revenge.”.