Since Heraclitus admits that the universe is an eternal fire, which is constantly transformed into everything, and everything is constantly transformed into fire, the idea of change will inevitably occupy an important position in his philosophy, so that later people call his philosophy the philosophy of change. He vividly expressed his thoughts on change. He said, "The sun is new every day."

In his view, nothing in the universe is absolutely static, everything is moving and changing. Engels spoke highly of his thought: "This primitive, simple but essentially correct world view is the world view of ancient Greek philosophy, and it was clearly expressed by Heraclitus for the first time: everything exists and does not exist at the same time, because everything is fluid, constantly changing, constantly producing and destroying."

Panta Rhein

Heraclitus famously said that "one cannot walk into the same river twice". This famous saying means that the water in the river is constantly flowing. This time you stepped into the river and the water ran away. Next time you step into the river, new water will flow.

The river keeps flowing, so you can't step into the same river. Obviously, this famous saying has its specific meaning, not the difference between this river and that river. Heraclitus advocated "the movement of all things" and "the flow of all things", which made him an outstanding representative of the "mobile school" with simple dialectical thought at that time.

Heraclitus' famous saying shows that objective things are always moving. Such a changing and developing truth. Engels once commented: "This primitive, simple but essentially correct world view is the world view of ancient Greek philosophy, which was first clearly expressed by Heraclitus.

Everything exists and does not exist at the same time, because everything is flowing, constantly changing, constantly producing and disappearing. "Heraclitus also believes that everything is transformed into each other. Cold becomes hot, hot becomes cold, wet becomes dry, and dry becomes wet. He also clearly asserted: "We didn't go down the same river. We exist and we don't exist. "