I'll keep it short: The only thing we know for sure is that there is existence.
This is proven by the fact that I at least believe that I am typing right now. Everything else about reality is constructed by the mind, and there is no way to know what the truth is. For all I know the people of this board only exist in the form of a couple of paragraphs of text. For all I know when I'm not around the world stops existing. For all you know I don't exist, and am just a paragraph in your mind, with a name attached to it.
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