Repetition of the same term is likely to happen in two ways: one is, when a man repeatedly uses the same word, as would happen if any one were to render, as a property of fire, the body which is the most rarefied of bodies (for he has repeated the word 'body'); the second is, if a man replaces words by their definitions, as would happen if any one were to render, as a property of earth, the substance which is by its nature most easily of all bodies borne downwards in space, and were then to substitute 'substances of such and such a kind' for 'bodies' (for a body and a substance of such and such a kind are one and the same thing).