Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Universal Arithmetick' by Isaac Newton and 'Walking the Tightrope of Reason' by Robert Fogelin

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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