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"We are rarely completely certain, but we are frequently certain…

- - - - having no doubt or knowing exactly that something is true, or known to be true, correct, exact, or effective
      - able to be firmly relied on to happen or be the case
  - - - Enough to apply?
      - Enough to claim that I "know"?
- - - - Can we carry out an operation to remove a brain tumor that we are not sure is cancerous?
  - - - What do we need to be certain for?
  - - - Decay VS Preservation
      - Lacking written records
  - - - Requirements for Certainty:
        
        A set of rules of proof with which to derive truths
        
        A guarantee that the rules of proof are adequate to establish all truths (completeness)
        
        A set of true axioms or postulates as the foundation for reasoning
        
        A guarantee that the rules of proof are safe in warranting only truths (consistency)