Combining Texts

You have chosen 'Action, Intention and Reason' by Robert Audi, 'Letters to Johann Bernoulli' by Gottfried Leibniz and 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer

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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