Conf. 13, 9.
Quote 11 1
By reason of its weight, the body strives to its own place. Yet a weight strives not so much to sink to the very lowest depths, but rather to its proper place. Fire tends upward; a stone downward. Oil poured out beneath water is raised up above water. Water poured on top of oil sinks down beneath the oil. They are impelled by their own weights; they seek their own places. Not put in proper order, they are without rest; when they are set in due order, they are at rest.