Combining Texts

You have chosen 'Letters to Thomas Burnett' by Gottfried Leibniz, 'Giordano Bruno and Hermetic Tradition' by Frances A. Yates and 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer

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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