Permanence and change
Do things have a fixed nature that lasts, or is the world better seen as constant change? The ancient Greeks Heraclitus and Parmenides are the classic opposites, and the question is still open.
What it is
A person grows from a child into an old adult and is still the same person. A river keeps its name while the water in it is never the same twice. A tree loses its leaves and grows them back. In each case something seems to stay while something else changes. The question of permanence and change asks which is more basic: the thing that lasts, or the change itself?
Is a thing a lasting nature that happens to change in small ways, or is the lasting thing only a pattern in a constant flow? How you answer shapes how you think about identity, tradition and whether anything is ever truly fixed.
The main views
- Things have lasting natures. A dog stays a dog from puppy to old age. Change happens to things, but they keep what makes them what they are. The ancient thinker Parmenides pushed this to an extreme: since what exists cannot come from nothing or turn into nothing, he argued, real being cannot change at all.
- Change is basic. Heraclitus is the thinker of change. His famous image is of a river that stays the same while different water flows through it. The river is what it is because of the flow.
- Process philosophy. A modern tradition takes the second view all the way: the basic units of reality are processes and events, and what looks like a lasting thing is a pattern that keeps going.
An example
Look at a candle flame. It seems to be one thing: you can point to it, and it keeps its shape. Yet it is made of burning wax and air that are constantly replaced. Is there a flame that lasts and changes its material, or is 'the flame' just a name for a process that never stops? Heraclitus would say the second. A defender of lasting natures would say that something about the flame stays the same, and that is what makes it a flame.
Why people still disagree
- The two thinkers are closer than they look. Heraclitus did not say everything dissolves into chaos. He said change follows a pattern, and that the pattern itself lasts. Parmenides may have been replying to Heraclitus rather than just contradicting him.
- Both sides need the other. If nothing lasted, we could not say what is changing. If nothing changed, we could not account for what we see.
- It reaches into everyday life. The same question lies behind whether people can truly change, whether traditions should be kept, and what it means for you to be the same person as the child you were.
Written by epchē in our own words, and checked against independent sources on 8 October 2026. The sources are listed below.
Philosophies that answer it
Where each philosophy leans on this question, from the same positions the walk uses.
Things have a lasting nature
Everything is always changing
Sources we used
- Heraclitus · Stanford Encyclopedia of Philosophy, read on 8 October 2026
- Heraclitus · Internet Encyclopedia of Philosophy, read on 8 October 2026
- Parmenides · Internet Encyclopedia of Philosophy, read on 8 October 2026
- Process Philosophy · Stanford Encyclopedia of Philosophy, read on 8 October 2026