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I did not intend to be condescending. I have been a materialist for 40 years; I have only recently adopted this new way of trying to understand reality. As to speculation, I claim that every type of mental knowledge is speculative to a certain extent as even the premises of a deductive statement have been gathered by induction, which is never 100% certain. Have a look at this article I wrote on that topic: https://steemit.com/philosophy/@technovedanta/metaphilosophy-an-essay-on-the-f-utility-of-philosophising