Combining Texts

You have chosen 'On Anger (Book 3)' by Seneca the Younger, 'Sets, Aggregates and Numbers' by Palle Yourgrau and 'Mind and Its Place in Nature' by C.D. Broad

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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