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“For Milesian philosophers Thales (c.â€�626/623—c.â€�548/545 BC), Anaximander (c.â€�610—c.â€�546 BC), and Anaximenes (c.â€�586/585—c.â€�526/525 BC) there was an ultimate principle they called arche. For Thales, this ultimate principle from which everything originated was water; for Anaximenes, it was air; and for Anaximander, it was Apeiron (limitless), whereas, for the Pythagoreans, the number was the ultimate principle.

For Heraclitus (c. 540—c. 480), arche was fire from which everything originated, but Logos was the ultimate principle uniting everything and connecting opposites.

For Anaxagora (c. 500—c. 428 BC), a hundred years after the Milesians, the ultimate principle was the mind (nous), which is limitless because it is not material.”
― Dejan Stojanovic