Combining Texts

You have chosen 'People and Their Bodies' by Judith (Jarvis) Thomson, 'Grundlagen der Arithmetik (Foundations)' by Gottlob Frege and 'The Passions of the Soul' by Ren Descartes

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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