The Gettiered counterexamples reveal the deficiency of traditional definition of knowledge that truth condition,belief condition and justification condition are not sufficient conditions for knowledge.The essence of Gettier counterexample is not false belief presented in justification and luck existing in cognitive activity,but that the justification supplied by protagonist is defective and doesn't absolutely warrant truth of the belief.In the end,Gettier problem is justification problem.In order to completely eliminate the possibility that the justified belief occasionally is true,epistemologists propose different additional conditions to traditional definition of knowledge from internalism and externalism.But those proposals not only couldn't rule out all Gettiered counterexamples,but also have problems of vagueness and being hard to operate.The new solution of Gettier counterexample is that protagonist should acknowledge that knowledge has relativity of context and fallibility and accept that there is lucky element in human knowledge,and combine the justification from the first personal position and the justification from the third personal position to support the true belief as far as possible.
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