Combining Texts

You have chosen 'On the Nature of the Universe' by Lucretius, 'Notes on Comments by Fardella' by Gottfried Leibniz and 'Sententia on 'De Caelo'' by Thomas Aquinas

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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