There cannot be an inquiry of more intense interest than to investigate the causes in which originate the differences among these three characters; or, in other words, the principles on which we can explain the fact, that the will of individuals may be influenced so differently with the same motives before them. These appear to be referable to three heads,—Knowledge,—Attention,—and Moral Habits.

I. A primary and essential element, in the due regulation of the will, is a correct knowledge of the truths and motives which tend to influence its determinations. The highest class of these comprehends the truths of religious belief,—a series of moral causes, the tendencies of which are of the most important kind, and calculated to exert a uniform power over every man who surrenders himself to their guidance. For this purpose, a correct knowledge of them is required, and, to all who have this knowledge within their reach, the careful acquisition involves a point of the deepest moral responsibility. The sacred writers speak in the strongest terms of the guilt attached to voluntary ignorance: and this must be obvious to every one who considers the clearness with which the highest truths are disclosed, and the incontrovertible evidence by which they are supported. This applies equally to the principles both of natural and of revealed religion. The important truths of natural religion are partly matters of the most simple induction from the phenomena of nature which are continually before us; and partly impressed upon our own moral constitution in the clearest and most forcible manner. From the planet revolving in its appointed orbit, to the economy of the insect on which we tread, all nature demonstrates, with a power which we cannot put away from us, the great incomprehensible One, a being of boundless perfections and infinite wisdom. In regard to his moral attributes, also, he has not left himself without a witness; for a sense of these he has impressed upon us in the clearest manner in that wondrous part of our constitution,—the moral principle or conscience. From these two sources may be derived a knowledge of the character of the Deity, and of our relation to him as moral beings;—and the man is left entirely without excuse who fails to direct to them his most earnest attention, and to make the impressions derived from them the habitual rule of his volitions, and the guide of his whole character. "He hath the rule of right within," says Butler, "all that is wanting is,—that he honestly attend to it."

Similar observations apply with equal or greater force to the truths of revealed religion. These are supported by a weight of miraculous evidence, and are transmitted to us by a chain of testimony, carrying absolute conviction to the mind of every candid inquirer. They are farther confirmed by a probability, and a force of internal evidence, which fix themselves upon the moral feelings of every sound understanding with a power which is irresistible. The whole is addressed to us as rational beings; it is pressed upon our attention as creatures destined for another state of existence; and the duty is imposed upon every individual seriously to examine and to consider. Every man is in the highest degree responsible for the care with which he has informed himself of these evidences, and for the attention with which he has given to every part of them its due weight in the solemn inquiry. He is farther responsible for the influence of previously formed prejudice, or that vitiated state of his moral feelings, which prevents him from approaching the subject with the simplicity of a mind which is seriously desirous of the truth. From the want of these essential elements of character, it may very often happen, that a man may fancy he has formed his opinions after much examination, while the result of his prejudiced or frivolous inquiry has been only to fix him in delusion and falsehood. Among the singular sophistries, indeed, by which some men shut their minds against inquiries of the highest import, is a kind of impression, not perhaps distinctly avowed in words, but clearly recognised in practice, that these subjects of belief are in great measure matters of opinion,—instead of being felt to rest upon the basis of immutable and eternal truth. Can any thing be more striking than the manner in which a late distinguished poet expresses himself on the subject of a future life,—as if this truth were a mere opinion which could be taken up or laid down at pleasure, to suit the taste of the individual inquirer;—"Of the two, I should think the long sleep better than the agonized vigil. But men, miserable as they are, cling so to any thing like life, that they probably would prefer damnation to quiet. Besides, they think themselves so important in the creation, that nothing less can satisfy then pride,—the insects!"[1] Such is the frivolous sophistry by which one, who holds a high rank in the literature of his country, could put away from him the most momentous inquiry that can engage the attention of a rational being.

II. Next to the acquisition of knowledge, and the formation of opinions, calculated to act upon us as moral beings, is the important rule of habitually attending to them, so as to bring their influence to bear upon our volitions. He, who honestly attends to what is passing within, will perceive that this is a voluntary exercise of his thinking and reasoning faculties. When a particular desire is present to his mind, he has the power to act upon the first impulse, or upon a very partial and limited, perhaps a distorted, view of the considerations and motives by which he ought to be influenced;—and he has the power to suspend acting, and direct his attention deliberately and fully to the facts and principles which are calculated to guide his determination. This is the first great step in that remarkable chain of sequences which belong to the regulation of the will. It is what every one is conscious of; and, putting aside all those metaphysical subtleties in which the subject has been involved, this constitutes man a free and responsible agent. In this important process, the first mental state is a certain movement of one of the desires or one of the affections;—we may use the term Inclination as including both. The second is a reference of the inclination to the moral causes or motives which more peculiarly apply to it,—especially the indications of conscience, and the principles of moral rectitude.—If these be found to harmonize with the inclination, volition and action follow, with the full concurrence of every moral feeling. If the inclination be condemned by these, it is, in a well-regulated mind, instantly dismissed, and the healthy condition of the moral being is preserved. But this voluntary and most important mental process may be neglected;—the inclination may be suffered to engross the mind and occupy fully the attention:—the power may not be exercised of directing it to moral causes and motives, and of comparing with them the inclination which is present. The consequence may be, that the man runs heedlessly into volition and action, from which the due exercise of this process of the mind might have preserved him.

But a third condition may take place which presents a subject of the highest interest. The moral causes may be so far attended to, as to prevent the inclination from being followed by action; while the inclination is still cherished, and the mind is allowed to dwell, with a certain feeling of regret, on the object which it had been obliged to deny itself. Though the actual deed be thus prevented, the harmony of the moral feelings is destroyed;—and that mental condition is lost which is strictly to be called purity of heart. For this consists in the desires and affections, as well as the conduct, being in strict subjection to the indications of conscience and the principles of moral rectitude. The inclination, thus cherished, gradually acquires greater ascendency over the moral feelings;—at each succeeding contest, it more and more occupies the mind; the attention is less and less directed to the moral truths and motives which are opposed to it; the inclination at length acquires the predominance, and is followed by volition. This is what we mean by a man being carried away by passion, in opposition to his moral conviction; for passion consists in a desire or an affection which has been allowed to engross the mind, until it gradually overpowers the moral causes which are calculated to counteract its influence. Now in the whole of this course each single movement of the mind is felt to be entirely voluntary. From that step, which constitutes the first departure from moral purity, the process consists in a desire being cherished which the moral feelings condemn; while, at each succeeding step, the influence of these feelings is gradually weakened, and finally destroyed. Such is the economy of the human heart, and such the chain of sequences to be traced in the moral history of every man, who, with a conviction upon his mind of what is right, has followed the downward course which gradually led him astray from virtue. When we trace such a process backwards in a philosophical point of view, the question still recurs,—what was the first step, or that by which the mind was led into the course which thus terminated in favour of vice. In the wonderful chain of sequences, which has been established in the mental constitution, it would appear that a very slight movement only is required for deranging the delicate harmony which ought to exist among the moral feelings; but this each individual feels to be entirely voluntary. It may consist in a desire being cherished which the moral feelings disapprove;—and, though the effect at first may be small, a morbid influence has arisen, which gains strength by continuance, and at last acquires the power of a moral habit. The more the desire is cherished, the less is the attention directed to the considerations or moral causes by which it might be counteracted. In this manner, according to the mental economy, these causes gradually lose their power over the volitions or determinations of the mind, and, at a certain period of this progress, the judgment itself comes to be changed respecting the moral aspect of the deed.

There is still another mental condition to be mentioned in connexion with this subject; in which the harmony of the moral feelings may be destroyed, without the action following. This takes places when the inclination is cherished, as in the former case, in opposition to the indications of conscience; while the action is opposed by some inferior motives,—as a regard to reputation or interest. The deed may thus be prevented, and the interests of society may benefit by the difference; but, so far as regards the individual himself, the disruption of moral harmony is the same; and his moral aspect must be similar in the eye of the Almighty One, who regards not the outward appearance alone, but who looketh into the heart. In this manner it may very often happen, that strong inducements to vice are resisted from motives referring merely to health, or to character. But this is not to overcome temptation,—it is only to balance one selfish feeling against another.

III. From the state of mind which has now been referred to, there gradually results a Moral Habit. This is a mental condition, in which a desire or an affection, repeatedly acted upon, is, after each repetition, acted upon with less and less effort,—and, on the other hand, a truth or moral principle, which has been repeatedly passed over without adequate attention, after every such act makes less and less impression, until at length it ceases to exert any influence over the moral feelings or the conduct. I had occasion to illustrate this remarkable principle in another point of view, when treating of the connexion between the emotions of sympathy and benevolence, and the conduct which naturally arises out of them. This conduct at first may require a certain effort, and is accompanied by a strong feeling of the emotion which leads to it. But, after each repetition, the acts go on with less feeling of the emotion, and less reference to the principle from which they spring, while there is progressively forming the habit of active benevolence. It is precisely the same with habits of vice. At first a deed requires an effort,—and a powerful contest with moral principles, and it is speedily followed by that feeling of regret, to which superficial observers give the name of repentance. This is the voice of conscience, but its power is more and more diminished after each repetition of the deed;—even the judgment becomes perverted respecting the first great principles of moral rectitude; and acts, which at first occasioned a violent conflict, are gone into without remorse, or almost without perception of their moral aspect. A man in this situation may still retain the knowledge of truths and principles which at one time exerted an influence over his conduct; but they are now matters of memory alone. Their power as moral causes is gone, and even the judgment is altered respecting their moral tendencies. He views them now perhaps as the superstitions of the vulgar, or the prejudices of a contracted education; and rejoices, it may be, in his emancipation from their authority. He knows not,—for he has not the moral perception now to know, that he has been pursuing a downward course, and that the issue, on which he congratulates himself, consists in his last degradation as a moral being. Even in this state of moral destitution, indeed, the same warning principle may still raise its voice,—unheeded but not subdued,—repelled as an enemy, not admitted as a friendly monitor and guide. "I have not the smallest influence over Lord Byron, in this particular," writes one of the chosen friends of that distinguished individual,—"if I had, I certainly should employ it to eradicate from his great mind the delusions of Christianity, which, in spite of his reason, seem perpetually to recur, and to lay in ambush for the hours of sickness and distress." It would be interesting to know what the particular impressions were, from which this sympathizing friend was anxious to rescue the poet. They were probably the suggestions of a power within, which, in certain seasons of reflection, compelled his attention in spite of his attempts to reason against it,—pleading with authority for a present Deity, and a life to come.

The principle of Habit, therefore, holds a most important place in the moral condition of every man; and it applies equally to any species of conduct, or any train of mental operations, which, by frequent repetition, have become so familiar, as not to be accompanied by a recognition of the principles in which they originated. In this manner good habits are continued without any immediate sense of the right principles by which they were formed; but they arose from a frequent and uniform acting upon these principles, and on this is founded the moral approbation which we attach to habits of this description. In the same manner, habits of vice, and habits of inattention to any class of duties, are perpetuated without a sense of the principles and affections which they violate; but this arose from a frequent violation of these principles, and a frequent repulsion of these affections, until they gradually lost their power over the conduct; and in this consists the guilt of habits. Thus, one person acquires habits of benevolence, veracity, and kindness,—of minute attention to his various duties,—of correct mental discipline,—and active direction of his thoughts to all those objects of attention which ought to engage a well regulated mind:—Another sinks into habits of listless vacuity or frivolity of mind,—of vicious indulgence and contracted selfishness,—of neglect of important duties, disregard to the feelings of others, and total indifference to all those considerations and pursuits which claim the highest regard of every responsible being; and the striking fact is, that, after a certain period, all this may go on without a feeling that aught is wrong either in the moral condition, or the state of mental discipline; such is the power of a moral habit.

The important truth, therefore, is deserving of the deepest and most habitual attention, that character consists in a great measure in habits, and that habits arise out of individual actions and individual operations of the mind. Hence the importance of carefully weighing every action of our lives, and every train of thought that we encourage in our minds; for we never can determine the effect of a single act, or a single mental process, in giving that influence to the character, or to the moral condition, the result of which shall be decisive and permanent. In the whole history of habits, indeed, we see a wondrous display of that remarkable order of sequences which has been established in our mental constitution, and by which every man becomes, in an important sense, the master of his own moral destiny. For each act of virtue tends to make him more virtuous; and each act of vice gives new strength to an influence within, which will certainly render him more more vicious.

These considerations have a practical tendency of the utmost interest. In subduing habits of an injurious character, the laws of mental sequences, which have now been referred to, must be carefully acted upon. When the judgment, influenced by the indications of conscience, is convinced of the injurious nature of the habit, the attention must be steadily and habitually directed to the truths which produced this impression. There will thus arise desire to be delivered from the habit,—or, in other words, to cultivate the course of action that is opposed to it. This desire, being cherished in the mind, is then made to bear upon every individual case in which a propensity is felt towards particular actions, or particular mental processes, referable to the habit. The new inclination is at first acted upon with an effort, but, after every instance of success, less effort is required, until at length the new course of action is confirmed, and overpowers the habit to which it was opposed. But that this result may take place, it is necessary that the mental process be followed, in the manner distinctly indicated by the philosophy of the moral feelings; for if this is not attended to, the expected effect may not follow, even under circumstances which appear, at first sight, most likely to produce it. On this principle we are to explain the fact, that bad habits may be long suspended by some powerful extrinsic influence, while they are in no degree broken. Thus, a person addicted to intemperance will bind himself by an oath to abstain, for a certain time, from intoxicating liquors. In an instance which has been related to me, an individual under this process observed the most rigid sobriety for five years, but was found in a state of intoxication the very day after the period of abstinence expired. In such a case, the habit is suspended by the mere influence of the oath; but the desire continues unsubdued, and resumes all its former power whenever this artificial restraint is withdrawn. The effect is the same as if the man had been in confinement during the period, or had been kept from his favourite indulgence by some other restraint entirely of an external kind; the gratification was prevented, but his moral nature continued unchanged.