On Liberty by John Stuart Mill was first published in 1859, and then became greatly influential and well-received world-wide. Introduced to it in the lectures, I took interest in reading this 100-page book, and decided to base my essay on it. The book itself goes on without many examples, but about 150 years after the publication, in many aspects it is still very closely related to things happening today. In no way would I be able to give a comprehensive illustration of what this book is about, but rather, I would like to take the pieces that touched me during my reading out, and to discuss the questions inspired. And I guess this is what reading a classic is usually about: people of different backgrounds read different things out of it, and the richness of the text enables everyone to think more about what they haven’t know.