Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'On Anger (Book 3)' by Seneca the Younger and 'Method and Results' by T.H. Huxley

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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