Chapter II.—Summary of the Opinions of Philosophers. Having, therefore, embraced (a consideration of) the tenets of all the wise men among the Greeks in four books, and the doctrines propounded by the heresiarchs in five, we shall now exhibit the doctrine concerning the truth in one, having first presented in a summary the suppositions entertained severally by all. For the dogmatists of the Greeks, dividing philosophy into three parts, in this manner devised from time to time their speculative systems; 1035 some denominating their system Natural, and others Moral, but others Dialectical Philosophy . And the ancient thinkers who called their science Natural Philosophy, were those mentioned in book i . And the account which they furnished was after this mode: Some of them derived all things from one, whereas others from more things than one . And of those who derived all things from one, some derived them from what was devoid of quality, whereas others from what was endued with quality. And among those who derived all things from quality, some derived them from fire, and some from air, and some from water, and some from earth. And among those who derived the universe from more things than one , some derived it from numerable, but others from infinite quantities. And among those who derived all things from numerable quantities, some derived them from two, and others from four, and others from five, and others from six. And among those who derived the universe from infinite quantities, some derived entities from things similar to those generated, whereas others from things dissimilar. And among these some derived entities from things incapable of, whereas others from things capable of, passion. From a body devoid of quality and endued with unity, the Stoics, then, accounted for the generation of the universe. For, according to them, matter devoid of quality, and in all its parts susceptible of change, constitutes an originating principle of the universe. For, when an alteration of this ensues, there is generated fire, air, water, earth. The followers, however, of Hippasus, and Anaximander, and Thales the Milesian, are disposed to think that all things have been generated from one (an entity), endued with quality. Hippasus of Metapontum and Heraclitus the Ephesian declared the origin of things to be from fire, whereas Anaximander from air, but Thales from water, and Xenophanes from earth. “For from earth,” says he, “are all things, and all things terminate in the earth.” 1036 1035     Hippolytus in what follows is indebted to Sextus Empiricus.— Adv. Phys ., x. 1036     See Karst., Fragm ., viii. 45.