4. What is Essence
4.1 Concrete Essence
Essence can refer to concrete things or abstract Dao Li. The definition of essence in Section 4.4.1, Chapter 4, Part 7 of Taiji Evolutionism is that essence is attributes of things related to interests of people.[4]
For example, the actual flight path of the Malaysia Airline plane MH370 before it crashed is unknown, and investigators have only been able to draw a possible range for the plane based on the time it exchanged data with satellites. The flight path of the plane is related to the interests of the families of the victims, so this route is the essence. The actual flight process of the plane is a specific event in the objective world, which belongs to the internal structure of the objective world. The picture drawn by the investigators is a model of the world structure in the subjective world.
According to Barthes, the actual flight route of Malaysia plane did not exist, which is certainly not true. But this actual route is not the source of our knowledge, nor is it the basis for testing truth. The test of truth is based on direct experiences, such as the time records of the Malaysia plane and satellite data exchange, the location of the Malaysia plane wreckage was found and other direct experience.
The Malaysia plane is a substance(Wu), and its flight is an event(Shi). There are substances and events that we can observe directly, and others that we cannot. Whether concrete things can be observed or not, as long as they are relevant to our interests, they can be regarded as essence. When you can't directly observe, the artificial model is the essence.
In many cases, essence refers to those things that cannot be directly observed, such as electron, meson and other microscopic matter and distant celestial bodies, as well as people and objects in the past such as the First Emperor of Qin and Epang Palace. Our understanding of them depends largely on reasoning and conjecture, then making models. They may be regarded as objectively existed, but since they cannot be directly observed, they are not the direct source of knowledge, nor the basis and standard for testing truth. The artificial model of them are the essences.