Combining Texts

You have chosen 'From an Ontological Point of View' by John Heil, 'The Passions of the Soul' by Ren Descartes and 'On the Foundations of Logic and Arithmetic' by David Hilbert

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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