III. Thinking in the Service of Understanding the World

There is a profound difference between the ways in which, for me, the parts of an event are related to one another before and after the discovery of the corresponding concepts. Mere observation can follow the parts of a given event as they occur, but their connection remains obscure without the help of concepts. I see the first billiard ball move toward the second in a certain direction and with a definite velocity. I must wait for what will happen after the impact, and again I can follow what happens only with my eyes. Let us assume that at the moment the impact occurs someone obstructs my view of the field where the event takes place: then—as mere onlooker—I have no knowledge of what happens afterward. The situation is different if before my view was obstructed I had discovered the concepts corresponding to the nexus of events. In that case I can estimate what occurs, even when I am no longer able to observe. An object or event which has only been observed does not of itself reveal anything about its connection with other objects or events. This connection comes to light only when observation combines with thinking.