Not only sensory data
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As it is now, the Popperian falsifiability principle has one widespread and altogether perverted use: it is implicitly restricted only to sensory data, which, in an incredibly hidden and sneaky fashion, automatically bars all mental and spiritual experience from the status of genuine knowledge. This unwarranted restriction of the falsifiability principle claims to separate genuine knowledge from the dogmatic, but all it actually accomplishes, in this shrunken form, is a silent but vicious re-ductionism.