This question is a rather difficult one to answer, mainly because there is no real right or wrong answer to it. It could take a lifetime of thinking to properly answer it, but I don't have that long so ill do the best I can! The first answer that immediately popped into my head when I first read the question was that "we cannot be sure we know something, we can't be sure we know …showed first 75 words of 508 total…

…showed last 75 words of 508 total…to it. As previously stated, this was a difficult question to discuss on a difficult subject area, which does not really have a right or wrong answer to it. I enjoyed thinking about this issue and I have, to the best of my ability, tried to give you my opinion on this matter, but I will have to leave it up to you to decide for yourself "how we can be sure we know something".