“We both step and do not step into the same, we both are and are not”

Heraclitus’ philosophy was concerned with change. None of Heraclitus’ writings survive in their original form, only in fragments repeated by others. This fragment comes from Heraclitus’ only known work, “On Nature”:

"We both step and do not step into the same, we both are and are not"

There are two more fragments of a similar nature that are either different intepretations of the same concept or continuations of the same work:

"It is not possible to step into the same river twice"

"On those who step into the same rivers, different and different waters flow"

Heraclitus saw the world as constant change; always becoming but never being.

“The hardest stone, in the light of what we have learned from chemistry, from physics, from mineralogy, from geology, from psychology, is in reality a complex vibration of quantum fields, a momentary interaction of forces, a process that for a brief moment manages to keep its shape, to hold itself in equilibrium before disintegrating again into dust…”