III. Thinking as the Instrument of Knowledge

The reason why it is impossible to observe the thinking in its actual occurrence at any given moment, is the same as that which makes it possible for us to know it more immediately and more intimately than any other process in the world. Just because it is our own creation do we know the characteristic features of its course, the manner in which the process, in detail, takes place. What in the other spheres of observation we can discover only indirectly, viz., the relevant objective nexus and the relations of the individual objects, that is known to us immediately in the case of thinking. I do not know off-hand why, for perception, thunder follows lightning, but I know immediately, from the content of the two concepts why my thinking connects the concept of thunder with that of lightning. It does not matter for my argument whether my concepts of thunder and lightning are correct. The connection between those concepts which I have is clear to me, and that by means of the very concepts themselves.