Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'On the spiritual perfection of life' by Thomas Aquinas and 'Against the Logicians (two books)' by Sextus Empiricus

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature