Combining Texts

You have chosen 'Nature and Utility of Religion' by John Stuart Mill, 'Launching Points to the Realm of the Mind' by Porphyry and 'On Platonism in Mathematics' by Paul Bernays

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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