Socrates' famous saying "Why can't a person cross the same river twice at the same time":

Let me try to tell you "One cannot step into the same river twice." "A river" is a philosophical saying. The point of view may be incorrect!

Heraclitus (about 530 BC - 470 BC) was a legendary philosopher. He was born into a royal family in the ancient Greek city-state of Ephesus. He didn't like the palace life, and often went to play with the children near the temple of the goddess Aldymes all day long. On the way to the temple of the goddess Aldymes, he had to pass through a shallow river. Every time he waded across the river, Everyone felt the changes in the water flow, sometimes clear and sometimes turbid, sometimes hot and sometimes cool, sometimes fast and sometimes slow... He stood blankly in the sun and thought deeply. Finally he said something: "One cannot step into the same water twice. river".

Yes, this famous saying has its own specific meaning. It does not refer to the difference between this river and that river. But when a person enters the river for the second time, it is new water flowing instead of the original water. Heraclitus summarized his thoughts on the change of movement in very concise language. This made him an outstanding representative of simple dialectical thinking at that time. In his thought, the view that movement is absolute and rest is relative was later adopted by materialism. Dialectics is absorbed. The basic viewpoint of materialist dialectics is that: the world is material, matter is in motion, movement is regular, and the laws can be understood. The world is an organic whole with universal connections, and at the same time it is changing and developing...

My point of view is the same as that of his student Cratylu. I agree with Cratylu's view that "people cannot step into the same river even once." I agree with the complete denial of the existence of stillness. You can even understand it as "the question I am answering you at this moment is no longer the question you just asked." You may criticize me for being a relativist sophistry. But I have my own Reason:

The world we perceive is a collection of three-dimensional objects. Thousands of things in human society exist in space established by length, width, and height, and are composed of the contact point "now" with time. in the mode. That is to say, in the four-dimensional space, when a person steps into a river, between the previous moment and the next moment, although you stay in the same place in space, time has changed. I think "people cannot step into the same river even once." "A river", everything is changing, only the constant itself does not change...

Maybe some philosophers will advise me after reading this: everything has a degree. Beyond its limits, if it is overdone, correct ideas will turn into absurd things. In fact, I don’t know whether I am right or wrong. As Socrates said: The only fact I know is that I actually know nothing...