4. But Empedocles stands opposite chafing, and crying aloud from Aetna ⁵. The principles of all things are enmity and friendship, the one drawing together, the other separating; and their strife makes all things. But I define these to be, like and unlike, boundless and having bounds, things eternal, and things made. Well done, Empedocles; I follow you now even up to the craters of fire. But on the other hand stands Protagoras, and draws me aside, saying, Man is the term and arbitrement of things, and those are things that fall under sensation: but those which do not so fall are not in the forms of being. Enticed by Protagoras with this description, I am pleased, because every thing or at least the greatest part is left to man. But on the other hand Thales nods the truth to me, defining water to be the principle of all, and that all things are formed out of the moist, and are - 196 - resolved into the moist,, and the earth rides over the water. Why then should I not listen to Thales the elder ⁶ of the Ionians? But his countryman Anaximander himself says that eternal motion is an older principle than moisture, and that by it some things are generated, and some things perish. And so let Anaximander be our guide.