Combining Texts

You have chosen 'Intro to G��del's Theorems' by Peter Smith, 'The Methods of Ethics (7th edn)' by Henry Sidgwick and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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