of the sensible world, or in the frame and government of the moral, must set out from the same first principles, and be carried on in the same method of investigation, induction, and reasoning; since both are enquiries into facts or real constitutions.
Natural philosophy described.
What is natural philosophy, how is it defined? or, how are its researches carried on? By it is understood an enquiry into the sensible world: that is “into the general laws, according to which its appearances are produced; and into the beauty, order, and good which these general laws produce.”
The principles it presupposes and proceeds upon in its enquiries.
And therefore in such an enquiry the following maxims are justly laid down as the foundations on which all its reasonings are built; or as the first principles from which all its conclusions are inferred; and without supposing which it cannot proceed one step.
First principle.
I. That if the corporeal world be not governed by general laws, it cannot be the object of enquiry or science; and far less of imitation by arts, since imitation necessarily presupposes knowledge of the object imitated; and science presupposes a certain determinate object; or fixed ascertainable relations and connexions of things. Upon the contrary supposition the corporeal world must be absolutely unintelligible. Nature, in order to be understood by us, must always speak the same language to us: it<3> must therefore steadily observe the same general laws in its operations, or work uniformly and according to stated, invariable methods and rules. Those terms, order, beauty, general good, and a whole, which are too familiar to philosophers, to need any definition, or explication, plainly include in their meaning, analogy and constancy; uniformity amidst variety; or in other words, the regular observance of general, settled laws in the make and oeconomy, production and operations, or effects of any object to which they are ascribed. Wherever order, fixed connexions, or general laws and unity of design take place, there is certainty in the nature of such objects; and so far therefore knowledge may be acquired. But where these do not obtain, there can be nothing but unconnected independent parts; all must be confusion and disorder; and consequently such a loose disjointed heap of things must be an inexplicable chaos. In one word, science, prudence, government, imitation, and art, necessarily suppose the prevalence of general laws throughout all the objects in nature to which they reach. No being can know itself, project or pursue any scheme, or lay down any maxims for its conduct; but so far as its own constitution is certain; and the connexion of things relative to it are fixed and constant; for so far only, are things ascertainable; and therefore so far only, can rules be drawn from them.
“Nature’sa operating according to general laws (says a very ingenious philosopher ) is so necessary for letting us into the secret of nature, and for our guidance in the affairs of life, that without it, all reach and compass of thought, all human sagacity could serve to no manner of purpose: it were even impossible there should be any such faculties or powers in the mind. It is<4> this alone, gives us that foresight which enables us to regulate our actions for the benefit of life: and without this, we should be eternally at a loss; we could not know how to act any thing that might procure us the least pleasure, or save us from the least pain. That food nourishes, sleep refreshes, and fire warms us; that to sow in the seed-time, is the way to reap in harvest; that to give application is the way to improve and arrive at perfection in knowledge, or in any moral virtue; and in general, that to obtain such or such ends, such or such means are conducive; all this we know, and only can know, by the observation of the settled laws of nature, without which we should be all in uncertainty and confusion, and a grown man no more know how to manage himself in the affairs of life, than an infant just born.”
This first principle in natural philosophy, is therefore indisputable. “That without the prevalence of general laws there can be no order; and consequently no foresight, no science: and that as all appearances in the corporeal world, which are reducible to general laws are explicable, so such as are not, are utterly inexplicable.” Or in other words, “such effects as are not always produced in the same way and method, and have always the same consequences and influences, are quite anomalous; they cannot be reduced to any rule or order, and for that reason, no conclusion can be inferred from them.” ’Tis only connexions which take place constantly in the same invariable manner that are ascertainable; or that can lay a foundation for science Theoretical or Practical.
Second principle.
II. Now those are justly called by philosophers, general laws in the sensible world. To which many effects are conformable. Or which, in other words, are observed to prevail and operate uniformly<5> in it; and regularly to produce like appearances. Thus, for instance, gravitation is concluded to be a general law throughout our mundan system, because all bodies are found to have gravity; not one body within the reach of our observation does not shew that quality: but even the most remote ones we are capable of observing, are found to operate according to it; that is, their appearances are reducible to it, as its natural and necessary effects.
This is very justly inferred, because to say, that analogous, or like appearances are not produced according to the same general law; or that they do not proceed from the same general principle, is indeed to say, that they are and are not analogous. Wherever we find analogy, or similarity of effects, there we find the same law prevailing; or so far do we find particular instances of the same property or law; or of the same method of production and operationa in nature. All this is really no more than asserting, for example, that whatever is produced conformably to a known principle, called gravity, is produced conformably to that principle. This second maxim in natural philosophy is therefore likewise indisputable.
“That those are general laws in a system, which prevail and operate uniformly in that system; or to which many effects in it are reducible and none are repugnant.” Or in other words, “those effects, however remote from us the objects are, to which they belong, may be justly attributed to that law or property, to which they are reducible, as its natural effects, that is known to be universal, so far as experience can reach;<6> for this very reason that such a known property being sufficient to produce them, is sufficient to account for them.”b
Third principle.
III. But in the third place, “Those general laws of the corporeal world are good laws, which by their steady and uniform prevalency produce its good, beauty, and perfection in the whole.” Thus, for instance, gravitation must be a good general law in the sensible or material world, if its uniform operation be conducive to the greatest good, beauty, and perfection of that system. ’Tis needless to define terms to natural philosophers, which are so commonly used by them; and if these terms have any meaning, the following argument must hold good, “All the interests of intelligent beings require that general laws should prevail, so far as they are concerned; nay, without general laws, there could be no union, no general connexion, and consequently no general beauty, good, or perfection, but all must be tumult, incoherence, and disorder.” It is therefore absolutely good and fit, that general laws should take place; and those laws must be good in a system, which produce in the sum of things, the greater coherence, order, beauty, good, and perfection of that system.
Now from this it necessarily follows, that no particular effects, which flow from good general laws, can be evils absolutely considered, that is, with regard to the whole. No effect, for example, of gravitation can be evil, if gravitation be a good general law in the sense above explained.
General conclusion concerning natural philosophy.
There is therefore a third maxim in philosophy, which is beyond all doubt. “That all the effects of general laws which are good with respect to a<7> whole, are good absolutely considered, or referred to that whole.”
Such effect as are reduced to general laws, are accounted for physically.
We may
