From the fact of motion we can go two ways: either we can treat motion according to its quantity, in which will divide motion according to a physical, numeral unit (which we get to make) or we can view it according to its way of being, which will divide it according to its principles of existence. In the first way, we get numerical values that can be combined and manipulated to yield an immense amount of power and knowledge; in the second way we get at what is most foundational and governing in our understanding of things. In practice, the first way requires a method that involves a specialized and controlled experience; the second method requires an analysis that stays on the level of our initial experience of things. To say that it relies on our initial experiences is not to say that it it uncritical or takes the experiences at face value. Both the kinds of endeavor are highly critical, analytic, and rigorous; but not according to the same methods.
The success of the division of motion according to its quantity- modern physics- serves as a model for all the other sciences of its kind, are now called simply “science”. The success of this brach of science makes it seem to many that it is the only possible kind o critical, rigorous and analytic account of physical experience. This is unnecessary. Would it be less true if it were not the only kind of analysis? This would be like thinking that man is less true since he is studied by anatomy and anthropology; or because he’s seen and heard.