Combining Texts

You have chosen 'Course of Positive Philosophy' by Auguste Comte, 'Introduction to the Theory of Logic' by Jos L. Zalabardo and 'What is an Idea?' by Gottfried Leibniz

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All the ideas for Knowledge Criteria, or select a subheading:
      A. Justification Problems
      B. Internal Justification
      C. External Justification
      D. Scepticism
      E. Relativism