The example is from Aristotle's three chapter on chance and fortune (Physics, II, iv, v, vi), the concluding sentence of which is worth quoting: "Chance (to automaton) and fortune (hê tuchê) something posterior to intelligence and natural development: so that however much chance be the cause of the system of the heavens, intelligence and natural development must needs be a prior cause, as well of many other things, as also of this universe."

Of God and His Creatures: 3.74