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 steelyard, 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.
It may also be said, that man can make a wheel and axis; that he can put wheels of different magnitudes together, and produce a mill. Still the case comes back to the same point, which is, that he did not make the principle that gives the wheels those powers. This principle is as unalterable as in the former cases, or rather it is the same principle under a different appearance to the eye.
The power that two wheels of different magnitudes have upon each other is in the same proportion as if the semi-diameter of the two wheels were joined together and made into that kind of lever I have described, suspended at the part where the semi-diameters join; for the two wheels, scientifically considered, are no other than the two circles generated by the motion of the compound lever.
It is from the study of the true theology that all our knowledge of science is derived; and it is from that knowledge that all the arts have originated.
The Almighty lecturer, by displaying the principles of science in the structure of the universe, has invited man to study and to imitation. It is as if he had said to the inhabitants of this globe that we call ours, “I have made an earth for man to dwell upon, and I have rendered the starry heavens visible, to teach him science and the arts. He can now provide for his own comfort, and learn from my munificence to all, to be kind to each other.”
Of what use is it, unless it be to teach man something, that his eye is endowed with the power of beholding, to an incomprehensible distance, an immensity of worlds revolving in the ocean of space? Or of what use is it that this immensity of worlds is visible to man? What has man to do with the Pleiades, with Orion, with Sirius, with the star he calls the north star, with the moving orbs he has named Saturn, Jupiter, Mars, Venus, and Mercury, if no uses are to follow from their being visible? A less power of vision would have been sufficient for man, if the immensity he now possesses were given only to waste itself, as it were, on an immense desert of space glittering with shows.
It is only by contemplating what he calls the starry heavens, as the book and school of science, that he discovers any use in their being visible to him, or any advantage resulting from his
