Combining Texts

You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'Essential vs Accidental Properties' by Adolph Rami and 'New Essays on Human Understanding' by Gottfried Leibniz

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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