Speech is a storehouse of images founded on experience, and therefore concepts which are too abstract do not easily take root in it, or quickly die out again for lack of contact with reality. But thinking and feeling are so obtrusively real that every language above the primitive level has absolutely unmistakable expressions for them. We can therefore be sure that these expressions coincide with perfectly definite psychic facts, no matter what the scientific definitions of these complex facts may be. Everyone knows, for example, what consciousness is, and nobody doubts that the concept covers
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