Those recollected objects, which have been transmitted by the senses, or which we have perceived by their means, are the subjects of our thoughts or reflections; for these terms will be indifferently employed, as designating the same faculty or process. The obvious meaning of the word reflection, is the representation of any object in a mirror. This term, so well understood in that department of natural philosophy named optics, has been transferred to mind, in order to explain a process, supposed to be similar. If, however, we examine the analogy, it will not accord:—to produce reflection in the mirror, the object must be present; in the mind, the reflection takes place when the object is absent. Although the simile, strictly speaking, is imperfect, yet the figure is beautiful, and, considering the metaphorical nature of language, as applied to mental operations, the most natural and appropriate that could have been selected; for, speaking in a general way, our thoughts, in themselves appear very much as the shadows or reflection of our perceptions. As we are but little capable of communicating the nature of our perceptions, independently of language, we must have recourse to inference and conjecture. It is fully understood that our visual perceptions, through the medium of recollection, may be represented by the skilful execution of the hand; and that those of smell, taste, and touch do not directly admit of such delineation. We might next inquire, if the odours we perceive are as strongly impressed on the olfactory organ, as the subjects of visual perception on the eye? Are they as fully and distinctly recollected? and are they capable by themselves of affording the materials for thought or reflection? Animals possess certain senses in common with ourselves; and, in many, the organs are more susceptible than our own; but there are no circumstances which have yet transpired, to induce us to suppose that the perceptions they have acquired are reviewed by their minds, when the objects which excited them are absent. The memory they possess of the perceptions they have experienced, is perhaps superior to that of human beings; still it does not appear, from any manifestations they afford, that it is actively exercised, as with ourselves, but occasionally excited by the recurrence of the object which originally produced it. Language is the pencil which marks the bold outline, and lends a colouring to our different perceptions; and with this boon man is exclusively gifted. A rational curiosity will prompt the reader to inquire, in what our perceptions consist independently of the language in which we ordinarily clothe them. In the instance of optical perception, we know that it is something which is retained by the memory, and may be traced by the hand, so as to convince others that it is truly remembered or recollected[15]; but let the same enquiry be made concerning the perceptions we receive by the touch, the smell, and the taste: in this investigation we shall experience much greater difficulty, as it is an endeavour to conceive the nakedness of a figure which is always clothed. That these perceptions must also be something abstracted from the terms which represent them, is proved, by the circumstance, that they are recollected when they occur again. As we are educated by language, and acquire a facility of employing it as the vehicle of our thoughts, we are little accustomed to contemplate the subject in this manner, and this also enhances the difficulty. When, however, the importance of speech is adequately considered, it will, I think, be detected, that the terms which we employ as the representatives of the perceptions of touch, smell, and taste, are the only media by which they can be voluntarily recollected or communicated to others; and, as signs of such perceptions, are equivalent to the representations by the hand of those which have been perceived by the organ of vision. To attempt the analysis of these silent deposits, to endeavour to describe these bare perceptions, would be altogether unavailing, because description implies language. In fact, it would be an effort to detect the symmetry of the human frame, by loading it with modern finery. The wonderful capacity which man exclusively enjoys, both for the communication of his thoughts, and for the improvement of his memory, in being enabled to acquire and transmit knowledge by impregnating sound with intelligence, and more especially in exhibiting its character embodied to the eye, leaves the rest of animated creation at a prodigious distance. This endowment of language to man, whereby he can, by an articulate sound, recall the perception of objects, (not indeed equal to the sensorial impression, but sufficient for their recollection, and also for the proof of their identity)—whereby he can with equal intelligence exhibit their character to the eye, is sufficient to explain of what the materials of his thoughts consist:—and to prove that animals being unable to substitute a term for their perceptions, are incapable of the process which we denominate thought or reflection. To fathom this mystery, is perhaps impossible; but, from attentively watching that which passeth within us,—from considering the state of animals which want this endowment altogether, it seems to be a law of our intellectual constitution, that our thoughts or reflections can only consist of the terms which represent our perceptions; and this is more evidently true, when we reflect on those subjects which are of a general or abstract nature.

Whoever will attentively watch the operation of his own mind,—for this subject admits of direct experiment,—will find that he employs terms when he conducts the process of reflection. In order to afford a fair trial, it is necessary that he should be alone, and subject to no interruptions. It will also add to the facility of the experiment, that he select a subject with which he is but little acquainted, as the process will be more deliberate. On topics with which we are familiar, we have acquired a rapidity of exercise which renders the detection of the process more difficult and perplexing. In this trial, he will be aware that he is repeating words as the materials of his thoughts. If the subject on which he should think involves persons with whom he is acquainted, or scenes he has viewed, he will, in addition to the terms he employs, have the pictures, or visible phantasmata, of these presented to his mind, conjunctively with such words. That we actually employ terms in this process is evident in many, who, when exercising their thoughts on any subject, are found, as we term it, talking to themselves; so that we are enabled to observe the motion of their lips: and this circumstance is to be noticed in most persons when they are counting.

The contrivances of language enable us to connect our thoughts; for our perceptions are distinct and individual, and of themselves can possess no elective attraction to associate and combine: they may however, by repetition or habit, become so allied, that the occurrence of one will excite the sequence of the other. We ordinarily recollect them very much in the order and succession of their occurrence; but we are also able to arrange and class them, and by such means, of recollecting them according to the artificial order of their distribution. This may be exemplified in the various expedients that have been devised for the acquirement and retention of knowledge: thus, chronology records events according to the order of their occurrence; an encyclopÆdia arranges according to alphabet or subject; and the most perfect of this kind, like the index to a book, consists in their mutual reference.

This wonderful faculty of thought or reflection, so far as we possess the means of detecting, appears to be peculiar to man; and if it be admitted to consist of our recollected perceptions, by the contrivances of language, we shall find that animals are not in possession of the necessary materials.

The ear transmits sounds to animals possessing this sense; and in some species it is so exquisitely susceptible, as to surpass, by many degrees, the acuteness of the same organ in the human subject. It is also recorded, that in some of the wilder tribes of man, the hearing possesses a delicacy of percipience unknown to the inhabitants of a polished community. Superadded to the conveyance of ordinary sound, the ear of man is the great inlet of communication, and the vehicle of articulate intelligence. Through the medium of this sense his knowledge becomes extended, and his memory improved; for every conversation is either a review of his stores, or an addition to his stock. As our thoughts or reflections are conducted by language, great caution is required that the terms we employ should possess a fixed and determinate meaning; and this is more especially important, when we employ words which are not the representatives of the objects of our perceptions, but of a complex nature, or, as they have been denominated, general terms; such as those which are used to designate the faculties and operations of the mind, and such as convey our moral attributes. The perfection of the process of thought, consists in the attention which the will can exert on the subjects of[16] consideration. The nature and endurance of the attention, which the organs of sense can bestow on the objects of perception, have been already discussed; and it will be found, that the same influence is directed when we exercise reflection: so that that mind is to be considered as most efficient, (in proportion to its natural capacity,) which can dwell on the subjects of its thoughts without interruption from irrelevant intrusions. The exertion of voluntary control over our thoughts has been denied; but if we were to subscribe to such doctrine, it would follow that this noble faculty of reflection would be merely a spontaneous concurrence of images and terms accidentally revived,—on rare occasions fortuitously blundering on wit, and ordinarily revelling in the absurdities of distraction. In proportion as we have been duly educated, we become enabled to direct and fix the organs of sense to the objects of perception, to be able at will to revive our memoranda, or to call on the memory to exhibit the deposits which have been confided to its custody, and to dwell pertinaciously on the materials of reflection. It is, however, certain, that in ordinary minds, the attention is little capable of being fixed to objects, and still less to the subjects of reflection; but this incapacity, in both instances, is principally to be attributed to the defects of education, and to a want of proper discipline of the intellectual powers. The endurance of attention in minds of the highest order, by a wise law of our constitution, is limited; and if it be attempted to continue the exertion beyond the natural power, the effort is infructuous. As straining the muscles produces fatigue, stiffness, and tremor;—as ocula spectra intrude on the forced and protracted attention of the visual organs,—so confusion ensues, when thought is racked and goaded to exhaustion.

As the staple of the human intellect is vastly superior to that of animals, so we find among our own species a considerable range of capacity; but however we may estimate mental excellence, it should be recollected, that its possession has seldom contributed to the happiness of the individual; so that experience would lead us to prefer the sober medium, which is included by a parenthesis, between the extremes of genius and dulness, and which appears to be the unenvied lot of the mass of society. The two great distinctions which mark the intellects of our species, seem to consist in the difference of character, which is established by those who excel in the exercise of their perceptions and consequent recollection, and those who cultivate and discipline the energies of thought. The former are distinguished by a vigorous activity, a penetrating and unwearied observation; their curiosity seems rather to be attracted by the object itself than directed by the mind. This incessant occupation and restless inquiry furnishes the memory with an abundant vocabulary: they recollect each object they have seen, and can retrace every path they have trodden; the ear greedily imbibes the conversations to which they are anxiously disposed to listen; that which they read, they verbally retain; they excel in quickness of perception and promptitude of memory, and appear to have every thing by heart; they are "the gay motes that people the sun-beams" of the intellectual world:—thus we find them, as inclination may sway, accurate chronologists, biographers pregnant with anecdote, expert nomenclators, botanists, topographers, practical linguists, and bibliographers; in short, the opulent possessors of whatever perception can detect, and memory preserve. The other order of men, (and they are comparatively few,) are the creatures of reflection:—with them the senses are little on the alert; they do not fatigue the wing by excursions through the field of nature; but that which the recollection retains becomes the subject of mental examination. An event is not registered from having merely occurred; but the causes which produced it are investigated, and a calculation is instituted concerning its probable tendency. Words are not simply regarded as the floating currency or medium of exchange, but they are severely subjected to analysis to establish their standard, or to detect the excess of their alloy; their senses are little awake to external impressions; the objects which a change of scene presents are slightly noticed, and feebly remembered; their curiosity is not attracted from without, but excited from within; they are strangers to the haunts of gay and mirthful intercourse, and are rather consulted as oracles, than selected as companions. This constant occupation of thought produces the philosophical historian, profound critic, physiologist, mathematician, general grammarian, etymologist, and metaphysician. After long exertion they become disposed to melancholic disquietude, and often turn in disgust from a world, the beauties of which they want an incentive to examine, and taste to admire. Both of these intellectual orders of our species contribute, but in different manners, to the stores of knowledge. The sound, efficient, and useful mind consists in a due balance and regular exercise of its different faculties.

How great soever the pains which an individual may bestow, to fix his thoughts to the examination of a particular subject, he will find that the effective duration of his attention is very limited, and that other thoughts, often wholly unconnected with the subject, will intrude and occupy his mind; on some occasions they are so prevailing and importunate, that he loses the original subject altogether. It is acknowledged, that the soundest and most efficient mind, is distinguished by the control it is capable of exerting on its immediate thoughts; which consist, as has before been observed, of terms, and the phantasmata of visible recollection:—this wandering of the thoughts to other subjects, or this intrusion of irrelevant words and pictures, whichever may be the case, appears to bear a very strong resemblance to a morbid state. It is usually the attendant on indolence, and has probably its source in a want of the proper occupation of mind, and, by indulgence, may become an incurable habit. Yet this rumination of mind has its votaries: by some it is courted as a delightful amusement, and eulogies are bestowed on the incoherent tissue of these reveries and day-dreams. Although these illegitimate offsprings of "retired leisure" may be considered as a perversion of the noblest attribute of man; yet they serve, in some degree, to recruit our recollection of past transactions, which might otherwise have faded in obscurity, or perished from natural decay. In the soundest and most refreshing sleep we seldom dream; so, in those wholesome exercises of the intellect where the mind is fully occupied, and, more especially, when such pursuit is combined with bodily exertion, these masterless associates do not intrude. By continuance, this habit may be so formidably increased, more especially under the guidance of malignant or depressing passions, that these shadows become embodied, and assume a form so potent and terrible, that the will is unable to bind them down, and the understanding attempts to exorcise them in vain.The act of thought or reflection, therefore, appears to consist, not in the operation of an exclusive and particular faculty, but in the voluntary recollection of pictures, as far as visible perception is involved, and of terms or words which are the types or representatives of our perceptions, together with those general terms, which are to be considered as abbreviations of meaning or intelligence. All this would, however, only amount to an act of memory, of such pictures and terms, particular and general; and would not comprehend or include their analysis, estimate, admeasurement, or ratio, with inquiries into their source and tendency, which is denominated reason, and which will compose the materials of the following chapter. Suffice it to observe that our thoughts on any subject can only be according to the extent of our knowledge of things and opinions; and, therefore, that our thoughts or reflections necessarily involve our reasonings, as they are only recollections without them.