... of oratory; theywere, in the main, and in their significant features, irrelevantto the academic tradition. The validity of knowledge was onlyone of his new puzzles; the value of knowing, the ... is the power of using sym-bols the power of speech—that makes him lord of the earth.So our interest in the mind has shifted more and more from the acquisition of experience, the domain of sense, ... symbols; they have meanings in terms of relationships, not of substance; something in reality an- THE NEW KEY 15swers to them, but they are not supposed to be items in thatreality. To the true mathematician,...