Professor Michel Gourinat's book reflects, above all, the fruits of a great teaching experience. Thanks to a thematic arrangement that simultaneously takes into account the general schemes and peculiarities of each thinker, the author clearly establishes the fundamental milestones of philosophical thinking. The examination of the various topics, grouped into sections (science, religion, metaphysics, morals, space and time, philosophy of nature and philosophy of spirit, conscience, freedom, language ...), introduces the reader to their respective problems , provides the indispensable basis to expand and deepen your study, and prepares to exercise, in front of the texts, a rigorous critical function.