Combining Texts

You have chosen 'Matter and Memory' by Henri Bergson, 'An Analysis of Knowledge and Valuation' by C.I. Lewis and 'Popular Scientific Lectures' by Ernst Mach

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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