Combining Texts

You have chosen 'Queries to the 'Opticks'' by Isaac Newton, 'Ancient Thought in Modern Physics' by Werner Heisenberg and 'Enquiry concerning Principles of Morals' by David Hume

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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