To me now, the greatness of Mao Zedong is that he was able to include in his "Contradiction Theory" the four dimensions that did not exist in that era and that seem to be mysterious and mysterious now.
When I was a child, I grew up surrounded by chaotic religions.
At that time, I had no way to explain why they said it was useful, but I felt that I didn't love it even though I believed it.
For the time being, I will explain my understanding of the movement of certain materials in four dimensions in an abstract way: human thoughts also move in tangible ways, which may not be explained until scientific development takes a long, long time, or may be unexplainable, but in the three-dimensional world, it becomes tangible and becomes intangible.
Intention: Look at the past, savor today, and look forward to the future