Heraclitusâ philosophy was concerned with change. None of Heraclitusâ writings survive in their original form, only in fragments repeated by others. This fragment comes from Heraclitusâ only known work, âOn Natureâ:
âWe both step and do not step into the same, we both are and are notâ
There are two more fragments of a similar nature that are either different intepretations of the same concept or continuations of the same work:
âIt is not possible to step into the same river twiceâ
âOn those who step into the same rivers, different and different waters flowâ
Heraclitus saw the world as constant change; always becoming but never being.
âThe 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 dustâŠâ