Combining Texts

You have chosen 'Frege's Concept of Numbers as Objects' by Crispin Wright, 'Launching Points to the Realm of the Mind' by Porphyry and 'Fifteen Sermons' by Joseph Butler

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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