Change is the only constant.
You cannot step twice into the same river.
Men who are lovers of wisdom [i.e., philosophers] must be inquirers into many things.
You can never step in the same river twice.
The world, an entity out of everything, was created by none of the gods or men, but was, is and will be eternally living fire, regularly becoming ignited and reg- ularly becoming extinguished.
Even sleepers are workers and collaborators on what goes on in the universe.