This depends on the type of justification you're using. I myself tend to side with Descartes and demand indefeasable evidence. All else I accept as belief. I also believe that some beliefs are stronger than others. where I find our senses fail us and they are not reliable enough for indefeasible evidence, I do think the senses strengthen beliefs. a belief that shows empirical proof is stronger than a belief that shows no proof at all. but either way, I can not know then with absolute certainty.
derrida 
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