The Age of Reason [15]
The scientific principles that man employs to obtain the foreknowledge of an eclipse, or of any thing else relating to the motion of the heavenly bodies, are contained chiefly in that part of science that is called trigonometry, or the properties of a triangle, which, when applied to the study of the heavenly bodies, is called astronomy; when applied to direct the course of a ship on the ocean, it is called navigation; when applied to the construction of figures drawn by a rule and compass, it is called geometry; when applied to the construction of plans of edifices, it is called architecture; when applied to the measurement of any portion of the surface of the earth, it is called land-surveying. In fine, it is the soul of science. It is an eternal truth: it contains the mathematical demonstration of which man speaks, and the extent of its uses are unknown.
It may be said, that man can make or draw a triangle, and therefore a triangle is an human invention.
But the triangle, when drawn, is no other than the image of the principle: it is a delineation to the eye, and from thence to the mind, of a principle that would otherwise be imperceptible. The triangle does not make the principle, any more than a candle taken into a room that was dark, makes the chairs and tables that before were invisible. All the properties of a triangle exist independently of the figure, and existed before any triangle was drawn or thought of by man. Man had no more to do in the formation of those properties or principles, than he had to do in making the laws by which the heavenly bodies move; and therefore the one must have the same divine origin as the other.
In the same manner as, it may be said, that man can make a triangle, so also, may it be said, he can make the mechanical instrument called a lever. But the principle by which the lever acts, is a thing distinct from the instrument, and would exist if the instrument did not; it attaches itself to the instrument after it is made; the instrument, therefore, can act no otherwise than it does act; neither can all the efforts of human invention make it act otherwise. That which, in all such cases, man calls the effect, is no other than the principle itself rendered perceptible to the senses.
Since, then, man cannot make principles, from whence did he gain a knowledge of them, so as to be able to apply them, not only to things on earth, but to ascertain the motion of bodies so immensely distant from him as all the heavenly bodies are? From whence, I ask, could he gain that knowledge, but from the study of the true theology?
It is the structure of the universe that has taught this knowledge to man. That structure is an ever-existing exhibition of every principle upon which every part of mathematical science is founded. The offspring of this science is mechanics; for mechanics is no other than the principles of science applied practically. The man who proportions the several parts of a mill uses the same scientific principles as if he had the power of constructing an universe, but as he cannot give to matter that invisible agency by which all the component parts of the immense machine of the universe have influence upon each other, and act in motional unison together, without any apparent contact, and to which man has given the name of attraction, gravitation, and repulsion, he supplies the place of that agency by the humble imitation of teeth and cogs. All the parts of man's microcosm must visibly touch. But could he gain a knowledge of that agency, so as to be able to apply it in practice, we might then say that another canonical book of the word of God had been discovered.
If man could alter the properties of the lever, so also could he alter the properties of the triangle: for a lever (taking that sort of lever which is called a steel-yard, for the sake of explanation) forms, when in motion, a triangle. The line it descends from, (one point of that line being in the fulcrum,) the line it descends to, and the chord of the arc, which the end of the lever describes