Reinhold’s Letters on the Kantian Philosophy is arguably the most influential book ever written concerning Kant. It provides a helpful introduction to Kant’s philosophy and a valuable explanation of how that philosophy can be understood as an appropriate Enlightenment solution to the ‘pantheism dispute’ which dominated thought in the era of German Idealism. The first edition of Kant’s Critique of Pure Reason was slow in gaining a positive reception, but after Reinhold’s Letters appeared Kant’s Critical Philosophy suddenly attained the central position which it has held to this day. The Letters also brought fame to Reinhold, who developed his own influential ‘Elementary Philosophy’ and was succeeded by the leading figures of German Idealism: Fichte, Schelling, and Hegel. This English edition of Reinhold’s work includes the original 1786-7 version as well as all the major additions and changes from the 1790 edition.