Combining Texts

You have chosen 'Tusculan Disputations' by M. Tullius Cicero, 'New System and Explanation of New System' by Gottfried Leibniz and 'De Mundo (On the World)' by Thomas Hobbes

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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