Fichte's System of Ethics, originally published in 1798, is at once the most accessible presentation of its author's comprehensive philosophical project, The Science of Knowledge or Wissenschaftslehre, and the most important work in moral philosophy written between Kant and Hegel. This study integrates the discussion of our moral duties into the systematic framework of a transcendental theory of the human subject. Ranging over numerous important philosophical themes, the volume offers a new translation of the work together with an introduction that sets it in its philosophical and historical contexts.