III. Thinking as the Instrument of Knowledge

I am, moreover, in exactly the same position when I enter into the exceptional state and reflect on own thinking. I can never observe my present thinking, I can only subsequently take my experiences about the process of my thinking as the object of fresh thinking. If I wanted to watch my present thinking, I should have to split myself into two persons, one to think, the other to observe this thinking. But this is impossible. I can only accomplish it in two separate acts. The thinking to be observed is never that in which I am actually engaged, but a different one. Whether, for this purpose, I make observations of my own former thinking, or follow the thinking-process of another person, or finally, as in the example of the motions of the billiard balls, assume an imaginary thinking-process, is immaterial.