Regress Argument - Structure

Structure

Assuming that knowledge is justified true belief, then:

  1. Suppose that P is some piece of knowledge. Then P is a justified true belief.
  2. The only thing that can justify P is another statement – let's call it P1; so P1 justifies P.
  3. But if P1 is to be a satisfactory justification for P, then we must know that P1.
  4. But for P1 to be known, it must also be a justified true belief.
  5. That justification will be another statement - let's call it P2; so P2 justifies P1.
  6. But if P2 is to be a satisfactory justification for P1, then we must know that P2 is true
  7. But for P2 to count as knowledge, it must itself be a justified true belief.
  8. That justification will in turn be another statement - let's call it P3; so P3 justifies P2.
  9. and so on, ad infinitum.

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