Combining Texts

You have chosen 'A Résumé of Metaphysics' by Gottfried Leibniz, 'III.10 On Restraining your Will' by Michel de Montaigne and 'Mathematical logic and theory of types' by Bertrand Russell

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds