Combining Texts

You have chosen 'A World of States of Affairs' by David M. Armstrong, 'On the Basis of Morality' by Arthur Schopenhauer and 'Ancient Thought in Modern Physics' by Werner Heisenberg

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction