Combining Texts

You have chosen 'On Second-Order Logic' by George Boolos, 'III.10 On Restraining your Will' by Michel de Montaigne and 'Why the Universe Exists' by New Scientist writers

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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