Combining Texts

You have chosen 'Dialogue on human freedom and origin of evil' by Gottfried Leibniz, 'Elements of Set Theory' by Herbert B. Enderton and 'Seven Quodlibets' by William of Ockham

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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