Combining Texts

You have chosen 'Quodlibeta' by Henry of Ghent, 'On the Happy Life' by Seneca the Younger and 'Mathematical Thought from Ancient to Modern Times' by Morris Kline

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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