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The only really existing man is A or B or C; man in general, man that is not a particular individual man, has no objective extra-mental existence. Here is a dilemma. The only thing we can really know is the thing that is not real, and the only real thing is that which we cannot know.

The persistent particles of mathematical physics I regard as logical constructions, symbolic fictions enabling us to express compendiously very complicated assemblages of facts; and, on the other hand, I believe that the actual data in sensation, the immediate objects of sight or touch or hearing, are extra-mental, purely physical, and among the ultimate constituents of matter.

The vulgar notion of correspondence here is that the thoughts must COPY the reality cognitio fit per assimiliationem cogniti et cognoscentis; and philosophy, without having ever fairly sat down to the question, seems to have instinctively accepted this idea: propositions are held true if they copy the eternal thought; terms are held true if they copy extra-mental realities.

Does he not tell us, as a result of his investigations, that we can know the external world only as it is reflected in our sensations, and thus seem to shut the mind up within the circle of mental phenomena merely, cutting off absolutely a direct knowledge of what is extra-mental?