The meaning of this question seems to assume an affirmative answer to the very issue in question: that there is absolute knowledge that knowledge is only probable or that there is absolute evidence that there is no absolute knowledge.
      If this is the intention of the question, it is oxymoronic and cannot be addressed.
      If the question intends, "What is your evidence for the claim that knowledge is only probable?" that can be addressed.
According to available evidence, all claims that absolute truth and knowledge "are possible" are untelligible for the following reasons:
      1) All knowledge is acquired directly or indirectly through and relates to our sense faculties which are prone to error.
      2) All our tools and instrumentation created to avoid the errors of our sense data are designed to accommodate our sense faculties.
      3) Absolute knowledge about anything requires total knowledge of the past, present, and future of the entire universe.
      4) No claim to knowledge is acceptable in the absence of evidence.
      5) Evidence is open-ended--never all in.
      6) To claim absolute knowledge given a particular context or set of beliefs is to abuse language and confuse the issue.
      7) There is a life-time history of man that empirical evidence has always been probable and open to correction with no evidence to the contrary.
      8) To claim that it is possible that there is absolute knowledge is to claim that there is evidence of that possibility but we just have not found it yet.
      9) The claim, "Anything is possible!" (Implying absolute knowledge is) is demonstrably and easily falsifiable, and is clearly false.

© 1997 by Pasqual S. Schievella