Combining Texts

You have chosen 'Rules for the Direction of the Mind' by René Descartes, 'Experience First (and reply)' by Dougherty,T/Rysiew,P and 'Letters to Coste' by Gottfried Leibniz

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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