Combining Texts

You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'Theory Change and the Indeterminacy of Reference' by Hartry Field and 'Definitiones cogitationesque metaphysicae' by Gottfried Leibniz

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge