Whether water or fire be most useful. (8)

Or can any man speak as follows in defence of the contrary? We say then that God, as a master workman, had before him the four elements, to complete the fabric of the universe; and these again were different one from another. But earth and water were placed at the foundation, like matter, to be formed and fashioned, participating of form and order and of power to procreate and bring forth, so far as they are assisted by air and fire, — the great artificers that mould them into various shapes, — and lying dead till roused by them to act and generate. Of these two latter, fire is the ruling agent. This is manifest by induction. For earth without warmth and heat is altogether barren and unfruitful; but fire, by virtue of its rousing and inflaming quality, renders it diffusive, and swells it into generation. Nor can any man find out any other cause why rocks and the dry tops of mountains are not productive, but because they participate either nothing at all or very little of fire.