To repeat, we can draw a boundary - for a special purpose. Though you still owe me a definition of exactness. The aspects of things that are most important for us are hidden because of their simplicity and familiarity. The real foundations of his enquiry do not strike a man at all. Unless that fact has at some time struck him.
Essence is expressed by grammar.
It is the only thing which one can milk out of this intrinsic necessity into a proposition. Grammar tells what kind of object anything is. Suppose they were drawings from which bodies were supposed to be modelled. The idea of the intangibility of that mental state in estimating the time is of the greatest importance. But not even all of them together show your intention.