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 in the air, are the three sides of a triangle. The other arm of the lever describes also a triangle; and the corresponding sides of those two triangles, calculated scientifically, or measured geometrically,—and also the sines, tangents, and secants generated from the angles, and geometrically measured,—have the same proportions to each other as the different weights have that will balance each other on the lever, leaving the weight of the lever out of the case.