Is that your definition of "know" or "knowledge"? Is that speakpidgeons definition of "know" and "knowledge"?
This is a thread where we discuss if "absolute truth" is a meaningful concept. Its not a discussion about sportresults...
Truth and knowledge are intertwined concepts. That is why it matters to this discussion.
"knowledge" us used in at least two ways:
1) a body of justified beliefs. (As in "this is common knowledge")
2) a very abstract, practically unusable, measure of the quality of information. (Knowledge as "true information"). This meaning is only "useful" when discussing metaphysical issues.
The confusion of these two results in a lot of unneccessary discussions.
So universality in a set doesn't work. So, why should we discuss absolutes about which we can not be certain for a variety of reasons. We don't know the physical world, we don't know about before us or after us, we don't know others, we can't know things since wee can never know a thing is unique, etc. Saying one knows something is meaningful only to that one and his interpretation of something.
Taking apart your points directly: Common knowledge is met by universal agreement among the 100 people I know that agree with me. Metaphysical issues are by definition 'coffee table talk' about stuff some think interesting, even important. Is that useful? By what metric? Truth and knowledge are convenient set points representing conviction and understanding.
We can discuss this until the cows come home. Since its already been discussed for more than 2500 years with no resolutions nor useful definitions (JTB) I consider it no more than a parlor game. We concluded about 300 years ago that rational method is limited by value and that the only thing we can tag as having value is the material world. So lets not go back to meaningless discussions. Let's concentrate on what we can evaluate, understanding and information.
You sure as hell aren't interested in discussing mind and psychology with one who will resort to interpreting studies based on several tens of thousands of hours of study and research in what are humans and how humans work at a conversational level.
Get off my case.