爱因斯坦说过：For me it is not dubious that our thinking goes on for the most part without use of signs (words) and
beyond that to a considerable degree unconsciously. For how, otherwise, should it happen that sometimes we "wonder" quite spontaneously about some experience? This "wondering" seems to occur when an experience comes into conflict with a world of concepts which is already sufficiently fixed in us. Whenever such a conflict is experienced hard and intensively it reacts back upon our thought world in a decisive way. The development of this thought world is in a certain sense a continuous flight from "wonder." A wonder of such nature I experienced as a child of four or five years, when my father showed me a compass.