Philosophy of Spiritual Activity
GA 4
  This is the sixth edition published in 1949 based on the original authorized translation by Prof. and Mrs. R. F. Alfred Hoernlé. Revised and amended by Hermann Poppelbaum, Phil.D.
- Editor's Preface to the 4th Edition, 1939
 - Preface to the Revised Translation, 1939
 - Preface to the Revised Edition, 1918
 
The Knowledge of Freedom
- Conscious Human Action
 - The Desire for Knowledge
 - Thinking as the Instrument of Knowledge
 - The World as Percept
 - The Act of Knowing (Cognizing) the World
 - Human Individuality
 - Are There Limits to Knowledge?
 
The Reality of Freedom
- The Factors of Life
 - The Idea of Freedom
 - Monism and the Philosphy of Spiritual Activity
 - World Purpose and Life Purpose
 - Moral Imagination
 - The Value of Life
 - Individuality and Species
 
Ultimate Questions
