>Hey, I'm not the one who think man can know everything. I'm quite content to admit I don't and cannot.

Me too. Where have I claimed otherwise? I see no limit in either direction to what we can :know".

>But, if you assert that you can 'know' or 'understand' reality.

Understand? No, not totally. For the same reason that you can not create a 100% accurate model of a house in the house that you're modelling.