Combining Texts

You have chosen 'Nature and Observability of Causal Relations' by Curt Ducasse, 'Les quaestiones de anima (lectures on the soul)' by Blasius of Parma and 'I.39 On Solitude' by Michel de Montaigne

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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