By his book "Three Lessons in Descartes", Alexander Kawara takes us on a trip to Descartes' mind, who doubted everything to search for the pure truth. These philosophical lessons deal with the main ideas presented by Descartes and their deep impact on the world of knowledge. While the book also deals with critical analyzes of these ideas and highlights the cultural and intellectual conditions in which Descartes affected. This rich work provides us with a unique window towards the mentality of one of the greatest philosophers in history.