This view is Heraclitus's view that people cannot step into the same river twice, which implies that people can still step into the river.

The former view is consistent with dialectical thinking, while the latter, which denies relative stillness, is a metaphysical thought.

Absolute motion causes everything to change, so a thing is not the same now as it was then. But at the same time, things also have the characteristic of being relatively static, so things themselves have unity. Before the essence changes, the thing is still itself.

Extended information:

One cannot step into the same river twice" is what the ancient Greek philosopher Heraclitus said. The philosophy of "change" was elaborated in the Milesian school and After the Pythagoreans, Heraclitus of Ephesus founded a philosophy of change. His philosophy was full of dialectical ideas and had a significant influence on the later development of dialectics.

Heraclitus. Since Laclit recognized that the universe is a fire that never goes out, that fire is constantly transformed into all things, and all things are constantly transformed into fire again, the idea of ??change will inevitably occupy an important position in his philosophy, so that later people called it His philosophy is the philosophy of change.

He vividly expressed his thoughts on change, saying: "The sun is new every day. "He compared existing things to a river, claiming that one cannot step into the same river twice. Because when one enters the river for the second time, new water flows instead of the original water. Heraclitus His thoughts on movement and change were summarized in very concise language: “Everything flows, nothing stays. "In his view, nothing in the universe is absolutely static and unchanging, everything is moving and changing.

Engels spoke highly of his idea: "This primitive, simple but The essentially correct worldview is the worldview of ancient Greek philosophy, and it was clearly stated for the first time by Heraclitus: everything exists and does not exist at the same time, because everything is flowing, constantly changing, and constantly changing. terrestrial creation and destruction. ”

But in reality, some people will still propose such a situation: that is, you can step into the river when it freezes. Therefore, there are two errors in analyzing this point of view from a metaphysical perspective: one is the separation movement. The relationship with stillness is metaphysical immobility that denies movement, talks only about stillness, and makes stillness absolute; the other is metaphysical relativism and sophistry that separates the relationship between movement and stillness, talks only about movement, and denies stillness.

Heraclitus (about 530 BC - 470 BC) was a legendary philosopher who was born into a royal family in the city-state of Ionia. He was supposed to inherit the throne, but he gave it to his brother and lived in seclusion near the temple of the goddess Aldymes. It is said that the Persian king Darius once wrote a letter inviting him to teach Greek culture in the Persian court. Leeteuk arrogantly refused.

Reference: Baidu Encyclopedia-Heraclitus