Book IX · Chapter 36

The rottenness of the matter which is the foundation of everything! water, dust, bones, filth: or again, marble rocks, the callosities of the earth; and gold and silver, the sediments; and garments, only bits of hair; and purple dye, blood; and everything else is of the same kind. And that which is of the nature of breath is also another thing of the same kind, changing from this to that.