Immanuel Kant was a German philosopher who is widely considered to be a central figure of modern philosophy. He argued that fundamental concepts structure human experience, and that reason is the source of morality. His thought continues to have a major influence in contemporary thought, especially in the fields of metaphysics, epistemology, ethics, political philosophy, and aesthetics. This work presents a perpective on the definitions of and relationships between such terms as duty, conscience, virtue and wisdom. This book is one of the most important works on moral philosophy ever written.