15.

But who can fail to perceive how great is the difference between useful observations of the heavenly bodies in connection with the weather, such as farmers or sailors make; or in order to mark the part of the world in which they are, and the course which they should follow, such as are made by pilots of ships or men going through the trackless sandy deserts of southern Africa; or in order to present some useful doctrine under a figure borrowed from some facts concerning heavenly bodies;--and the vain hallucinations of men who observe the heavens not to know the weather, or their course, or to make scientific calculations, or to find illustrations of spiritual things, but merely to pry into the future and learn now what fate has decreed?