Combining Texts

You have chosen 'On the Happy Life' by Seneca the Younger, 'Identity in Substances and True Propositions' by Gottfried Leibniz and 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero

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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