In Nature, however, there can be only natural causes and effects; all motion excited in this Nature, follows constant and necessary laws: the natural operations, to the knowledge of which we are competent, of which we are in a capacity to judge, are of themselves sufficient to enable us to discover those which elude our sight; we can at least judge of them by analogy. If we study Nature with attention, the modes of action which she displays to our senses will teach us not to be disconcerted by those which she refuses to discover. Those causes which are the most remote from their effects, unquestionably act by intermediate causes; by the aid of these, we can frequently trace out the first. If in the chain of these causes we sometimes meet with obstacles that oppose themselves to our research, we ought to endeavour by patience and diligence to overcome them; when it so happens we cannot surmount the difficulties that occur, we still are never justified in concluding the chain to be broken, or that the cause which acts is SUPER-NATURAL. Let us, then, be content with an honest avowal, that Nature contains resources of which we are ignorant; but never let us substitute phantoms, fictions, or imaginary causes, senseless terms, for those causes which escape our research; because, by such means we only confirm ourselves in ignorance, impede our enquiries, and obstinately remain in error.
In spite of our ignorance with respect to the meanderings of Nature, (for of the essence of being, of their properties, their elements, their combinations, their proportions, we yet know the simple and general laws, according to which bodies move;) we see clearly, that some of these laws, common to all beings, never contradict themselves; although, on some occasions, they appear to vary, we are frequently competent to discover that the cause becoming complex, from combination with other causes, either impedes or prevents its mode of action being such as in its primitive state we had a right to expect. We know that active, igneous matter, applied to gunpowder, must necessarily cause it to explode: whenever this effect does not follow the combination of the igneous matter with the gunpowder—whenever our senses do not give us evidence of the fact, we are justified in concluding, either that the powder is damp, or that it is united with some other substance that counteracts its explosion. We know that all the actions of man have a tendency to render him happy: whenever, therefore, we see him labouring to injure or destroy himself, it is just to infer that he is moved by some cause opposed to his natural tendency; that he is deceived by some prejudice; that, for want of experience, he is blind to consequences: that he does not see whither his actions will lead him.
If the motion excited in beings was always simple; if their actions did not blend and combine with each other, it would be easy to know, and we should be assured, in the first instance, of the effect a cause would produce. I know that a stone, when descending, ought to describe a perpendicular: I also know, that if it encounters any other body which changes its course, it is obliged to take an oblique direction, but if its fall be interrupted by several contrary powers, which act upon it alternately, I am no longer competent to determine what line it will describe. It may be a parabola, an ellipsis, spiral, circular, &c. this will depend on the impulse, it receives, and the powers by which it is impelled.
The most complex motion, however, is never more than the result of simple motion combined: therefore as soon as we know the general laws of beings and their action, we have only to decompose, to analyse them, in order to discover those of which they are combined; experience teaches us the effects we are to expect. Thus it is clear, the simplest motion causes that necessary junction of different matter, of which all bodies are composed: that matter, varied in its essence, in its properties, in its combinations, has each its several modes of action or motion, peculiar to itself; the whole motion of a body is consequently the sum total of each particular motion that is combined.
Amongst the matter we behold, some is constantly disposed to unite, whilst other is incapable of union; that which is suitable to unite, forms combinations, more or less intimate, possessing more or less durability: that is to say, with more or less capacity to preserve their union, to resist dissolution. Those bodies which are called SOLIDS, receive into their composition a great number of homogeneous, similar, and analogous particles, disposed to unite themselves with energies conspiring or tending to the same point. The primitive beings, or elements of bodies, have need of supports, of props; that is to say, of the presence of each other, for the purpose of preserving themselves; of acquiring consistence or solidity: a truth, which applies with equal uniformity to what is called physical, as to what is termed moral.
It is upon this disposition in matter and bodies, with relation to each other, that is founded those modes of action which natural philosophers designate by the terms attraction, repulsion, sympathy, antipathy, affinities, relations; that moralists describe under the names of love, hatred, friendship, aversion. Man, like all the beings in nature, experiences the impulse of attraction and repulsion; the motion excited in him differing from that of other beings, only, because it is more concealed, and frequently so hidden, that neither the causes which excite it, nor their mode of action are known. This system of attraction and repulsion is very ancient, although it required a NEWTON to develop it. That love, to which the ancients attributed the unfolding, or disentanglement of chaos, appears to have been nothing more than a personification of the principle of attraction. All their allegories and fables upon chaos, evidently indicate nothing more than the accord or union that exists between analogous and homogeneous substances; from whence resulted the existence of the universe: whilst discord or repulsion, which they called SOIS, was the cause of dissolution, confusion, and disorder; there can scarcely remain a doubt, but this was the origin of the doctrines of the TWO PRINCIPLES. According to DIOGENES LAERTIUS, the philosopher, EMPEDOCLES, asserted, that "there is a kind of affection by which the elements unite themselves; and a sort of discord, by which they separate or remove themselves."
However it may be, it is sufficient for us to know that by an invariable law, certain bodies are disposed to unite with more or less facility; whilst others cannot combine or unite themselves: water combines itself readily with salt, but will not blend with oil. Some combinations are very strong, cohering with great force, as metals; others are extremely feeble, their cohesion slight and easily decomposed, as in fugitive colours. Some bodies, incapable of uniting by themselves, become susceptible of union by the agency of other bodies, which serve for common bonds or MEDIUMS. Thus, oil and water, naturally heterogeneous, combine and make soap, by the intervention of alkaline salt. From matter diversely combined, in proportions varied almost to infinity, result all physical and moral bodies; the properties and qualities of which are essentially different, with modes of action more or less complex: which are either understood with facility, or difficult of comprehension, according to the elements or matter that has entered into their composition, and the various modifications this matter has undergone.
It is thus, from the reciprocity of their attraction, the primitive imperceptible particles of matter, which constitute bodies, become perceptible, form compound substances, aggregate masses; by the union of similar and analogous matter, whose essences fit them to cohere. The same bodies are dissolved, their union broken, whenever they undergo the action of matter inimical to their junction. Thus by degrees are formed, plants, metals, animals, men; each grows, expands, and increases in its own system or order; sustaining itself in its respective existence, by the continual attraction of analogous matter; to which it becomes united, and by which it is preserved and strengthened. Thus, certain aliments become fit for the sustenance of man, whilst others destroy his existence: some are pleasant to him, strengthen his habit; others are repugnant to him, weaken his system: in short, never to separate physical from moral laws, it is thus that men, mutually attracted to each other by their reciprocal wants, form those unions which we designate by the terms, MARRIAGE, FAMILIES, SOCIETIES, FRIENDSHIPS, CONNEXIONS: it is thus that virtue strengthens and consolidates them; that vice relaxes or totally dissolves them.
Of whatever nature may be the combination of beings, their motion has always one direction or tendency: without direction we could not have any idea of motion: this direction is regulated by the properties of each being; as soon as they have any given properties, they necessarily act in obedience to them: that is to say, they follow the law invariably determined by these same properties; which, of themselves, constitute the being such as he is found, and settle his mode of action, which is always the consequence of his manner of existence. But what is the general direction, or common tendency, we see in all beings? What is the visible and known end of all their motion? It is to conserve their actual existence—to preserve themselves—to strengthen their several bodies—to attract that which is favorable to them—to repel that which is injurious them—to avoid that which can harm them—to resist impulsions contrary to their manner of existence, and to their natural tendency.
To exist, is to experience the motion peculiar to a determinate essence: to conserve this existence, is to give and receive that motion from which results its maintenance:—it is to attract matter suitable to corroborate its being—to avoid that by which it may be either endangered or enfeebled. Thus, all beings of which we have any knowledge, have a tendency to conserve themselves, each after its peculiar manner: the stone, by the firm adhesion of its particles, opposes resistance to its destruction. Organized beings conserve themselves by more complicated means, but which are, nevertheless, calculated to maintain their existence against that by which it may be injured. Man, both in his physical and in his moral capacity, is a living, feeling, thinking, active being; who, every instant of his duration, strives equally to avoid that which may be injurious, and to procure that which is pleasing to him, or that which is suitable to his mode of existence; all his actions tending solely to conserve himself. ST. AUGUSTINE admits this tendency in all whether organized or not.