Page "History of philosophy" Paragraph 6

Other thinkers and schools appeared throughout Greece over the next couple of centuries.

Among the most important were Heraclitus (" all is fire ", all is chaotic and transitory ), Anaxagoras ( reality is so ordered that it must be in all respects governed by mind ), the Pluralists and Atomists ( the world is composite of innumerable interacting parts ), the Eleatics Parmenides and Zeno ( all is One and change is impossible, as illustrated by his famous paradoxes of motion ), the Sophists ( became known, perhaps unjustly, for claiming that truth was no more than opinion and for teaching people to argue fallaciously to prove whatever conclusions they wished ).

This whole movement gradually became more concentrated in Athens, which had become the dominant city-state in Greece.