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“In its stable state air is invisible, but when it is moved and condensed it becomes first wind and then cloud and then water, and finally water condensed becomes mud and stone. Rarefied air became fire, thus completing the gamut of the elements. In this way rarefaction and condensation can conjure everything out of the underlying air. In support of this claim Anaximenes appealed to experience, and indeed to experiment â€� an experiment that the reader can easily carry out for herself. Blow on your hand, First with the lips pursed, and then from an open mouth: the First time the air will feel cold, and the second time hot. This, argued Anaximenes, shows the connection between density and temperature.”
― Anthony Kenny, Ancient Philosophy

“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