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Then too, that which by multiplication destroys its own contribution is the less useful. Such a thing is fire which, like an all-devouring beast, consumes everything near, so that it is useful rather by skilful handling and craft and moderation in use than by its own nature; but water is never dangerous. Further, of two things the one which may be joined with its fellow is more useful. Now fire does not admit moisture and is of no use when in conjunction with it; but water is of service when combined with fire, for hot water is healing and well adapted to medicinal purposes. A watery fire you will never see; but water is as useful to mankind when hot as when cold.
