The 'Lectures on Homoeopathic Philosophy' remain the most important theoretical treatise on Classical Homeopathy today. Pierre Schmidt has thoroughly reviewed the difficult-to-understand American original edition, and his work served as the basis for Jost Künzli's translation. In cases of doubt, Schmidt consulted the views of direct students of Kent, ensuring that Kent's ideas were not distorted. Of particular value are Kent's discussions on Hahnemann's 'Organon' and 'The Chronic Diseases.' This new edition is supplemented by a biography of Kent by Pierre Schmidt, as well as a foreword by Dario Spinedi. Kent's 'Theory of Homeopathy' is one of the works that every homeopathic physician must engage with intensively.