The genius John Stuart Mill is revealed in this small yet huge essay about the relationship between free individuals, and the relationship between free individuals with the state. In this book is based the principle that a person's freedom ends where another's begins. It also states that each person is responsible for his own destiny. The state can not force anyone to do something that could even benefit them as a person if doing so goes against their will. On Liberty is a fundamental book in the library of classical liberalism.