be equal to north. You can step twice into the same river, at the same time, you can’t step twice into the same river.

Dialectical corresponding relation makes a great difference between the cognition of concept composition and the objective world itself. This difference brings us a lot of trouble, but there is no way. We have to use the abstract way to understand the world. We can’t do without this colored glasses. No matter how the cognition changes, it can’t become the objective world and its movement itself. This is what Lao Tzu said, “The Tao can be described, but it is not the normal Tao.”

The opposition of contradictions is abstract opposition, and the unity of contradictions is concrete unity under certain conditions. For example, at a crossroad, the north and the south can’t go while the east and the west go, they are in contradiction. So how to achieve the unity of the contradiction? If an overpass is built, east and west, north and south can go at the same time. The overpass is the specific condition that realizes contradiction to unify. In the objective and concrete world, there are no contradictions.

All contradictions are made by people with the colored glasses. Therefore, all contradictions can be unified in the objective and concrete world. Why can’t many people understand dialectics? Because it’s really ridiculous. It doesn’t exist in the objective world. Dialectics exists only in the subjective world or in the relationship between the subjective world and the objective world. Because our human understanding is subjective, we can’t do without colored glasses, so we have to accept dialectics, we have to accept the dialectical unity between subjective world and objective world.

In fact, all the ways of cognition are colored glasses, are a distortion of the objective world. For example, human vision can only see visible light, human sense of smell, hearing, touch are much worse than animals. Human do not have the sonar system like bats. Many animals can see we can’t see. Our senses are all colored glasses, and so are all our ways of thinking.