II. The Logic of Thought and the Logic of Reality

Now the peculiar thing in Mach was that instinctively, every now and then, he withdrew from his own world-conception—from his radical, positivist world-conception. He withdrew a little, saying to himself: These then are the results of truly modern thought. It is meaningless to say that anything exists beyond my sensation or that I should distinguish the physical and the psychical. And yet I am impelled again and again whenever I have the table before me, to speak not merely of the sensation, but to believe that there is something out there, quite physically. And again when I have an idea, a sensation or a feeling, I have not merely the perception of the phenomenon which takes place, but though by my scientific insight I realize that it is quite unjustified—still I believe that here within me is the soul, and out there is the object. I feel myself impelled again and again to make this distinction how does it come about? Mach said to himself: however does it come about that I am suddenly impelled to assume; in here is something of the soul, and out there is something external to the soul. I know that it is no true distinction, yet am I continually compelled to think something different from what my scientific insight tells me.