Combining Texts

You have chosen 'Course of Positive Philosophy' by Auguste Comte, 'What is the Basis of Moral Obligation?' by H.A. Prichard and 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz

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All the ideas for Existence, or select a subheading:
      A. Nature of Existence
      B. Change in Existence
      C. Structure of Existence
      D. Theories of Reality
      E. Categories