In this book about Kant’s critical philosophy, the author undertakes the unusual task of presenting, although in an introductory manner, the set of themes and problems that have interested Kant’s scholars over the course of these two centuries. Going beyond the mere juxtaposition of themes, to which the broad expositions of the Kantian work are generally limited, the author provides a line of interpretation that allows us to grasp in an articulated way the various parts of the daring program of this critical philosophy that has revolutionized the way we approach the ultimate questions that have always interested the human race.