Heraclitus is known for his belief in which of the following concepts?

Heraclitus is prominently recognized for his belief in the concept of constant change, which is encapsulated in his famous assertion that "you cannot step into the same river twice." This statement illustrates his view that everything is in a state of flux, and he emphasized that change is the fundamental essence of the universe. Heraclitus believed that stability is an illusion and that opposites are essential to the harmony of the world. He introduced the idea that conflict and tension are necessary components of existence, thereby highlighting the dynamic nature of reality.

The other concepts, while significant in the history of philosophy, do not align with Heraclitus' foundational ideas. The notion of a static universe promotes the idea of unchanging reality, which contradicts his views on perpetual change. Perfect forms are more closely associated with Plato’s philosophy, focusing on idealized versions of objects or concepts. Sensory perception relates to empiricism and the processes of perception, which were later explored by philosophers such as John Locke and George Berkeley, rather than being central to Heraclitus’ beliefs. Thus, constant change accurately reflects Heraclitus' core philosophical position.