Combining Texts

You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Letters to Blijenburgh' by Baruch de Spinoza and 'Of the Laws of Ecclesiastical Polity' by Richard Hooker

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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