How then? Do not Plato, Aristotle, and Xenocrates produce gold from that which is not gold, and stone from that which is not stone, and many other things from the four simple first bodies? Yes indeed; but with those bodies immediately concur also the principles for the generation of every thing, bringing with them great contributions, that is, the first qualities which are in them; then, when they come to assemble and join in one the dry with the moist, the cold with the hot, and the solid with the soft, — that is active bodies with such as are fit to suffer and receive every alteration and change, — then is generation wrought by passing from one temperature to another. Whereas the atom, being alone, is deprived and destitute of all quality and generative faculty, and when it comes to meet with the others, it can make only a noise and sound because of its hardness and firmness, but nothing else. For they always strike and are stricken, not being able by this means to compose or make an animal, a soul, or a nature, nay, not so much as a mass or heap of themselves; for that as they beat upon one another, so they fly back again asunder.