2019 Reprint of 1922 Edition. Full facsimile of the original edition and not reproduced with Optical Recognition Software. Moore played as important a part in the development of modern philosophy as his contemporary, Bertrand Russell. Principia Ethica is the first, and the most famous, of his few published works. Principia Ethica is concerned with the basic principles of ethical reasoning. Two questions are all important: what kind of things are intrinsically good; and what kind of actions ought we to perform? The simplicity, clarity and common sense of Moore's writing bring fresh life to the study of ethics; his intellectual honesty and vigor give this book the stamp of greatness. -From the back cover.