From what is above observed, concerning our natural power of habits, it is easy to see, that we are capable of moral improvement by discipline. And how greatly we want it, need not be proved to any one who is acquainted with the great wickedness of mankind; or even with those imperfections, which the best are conscious of. But it is not perhaps distinctly attended to by every one, that the occasion which human creatures have for discipline, to improve in them this character of virtue and piety, is to be traced up higher than to excess in the passions, by indulgence and habits of vice. Mankind, and perhaps all finite creatures, from the very constitution of their nature, before habits of virtue, are deficient, and in danger of deviating from what is right; and therefore stand in need of virtuous habits, for a security against this danger. For, together with the general principle of moral understanding, we have in our inward frame various affections towards particular external objects. These affections are naturally, and of right, subject to the government of the moral principle, as to the occasions upon which they may be gratified; as to the times, degrees, and manner, in which the objects of them may be pursued. But the principle of virtue can neither excite them, nor prevent their being excited. On the contrary, they are naturally felt, when the objects of them are present to the mind, not only before all consideration whether they can be obtained by lawful means, but after it is found they cannot. The natural objects of affection continue so; the necessaries, conveniences, and pleasures of life, remain naturally desirable, though they cannot be obtained innocently: nay, though they cannot possibly be obtained at all. And when the objects of any affection whatever cannot be obtained without unlawful means; but may be obtained by them: such affection, though its being excited, and its continuing some time in the mind, be as innocent as it is natural and necessary, yet cannot but be conceived to have a tendency to incline persons to venture upon such unlawful means: and therefore must be conceived as putting them in some danger of it. Now what is the general security against this danger, against their actually deviating from right? As the danger is, so also must the security be, from within: from the practical principle of virtue.[98] The strengthening or improving this principle, considered as practical, or as a principle of action, will lessen the danger, or increase the security against it. And this moral principle is capable of improvement, by proper discipline and exercise: by recollecting the practical impressions which example and experience have made upon us: and, instead of following humor and mere inclination, by continually attending to the equity and right of the case, in whatever we are engaged, be it in greater or less matters; and accustoming ourselves always to act upon it, as being itself the just and natural motive of action; and as this moral course of behavior must necessarily, under the divine government, be our final interest. Thus the principle of virtue, improved into a habit, of which improvement we are thus capable, will plainly be, in proportion to the strength of it, a security against the danger which finite creatures are in, from the very nature of propension, or particular affections. This way of putting the matter, supposes particular affections to remain in a future state; which it is scarce possible to avoid supposing. And if they do; we clearly see, that acquired habits of virtue and self-government may be necessary for the regulation of them. However, though we were not distinctly to take in this supposition, but to speak only in general; the thing really comes to the same. For habits of virtue, thus acquired by discipline, are improvement in virtue: and improvement in virtue must be advancement in happiness, if the government of the universe be moral.

From these things we may observe, (and it will further show this our natural and original need of being improved by discipline,) how it comes to pass, that creatures made upright, fall; and how those who preserve their uprightness, raise themselves by so doing, to a more secure state of virtue. To say that the former is accounted for by the nature of liberty, is to say no more, than that an event’s actually happening is accounted for by a mere possibility of its happening. But it seems distinctly conceivable from the very nature of particular affections or propensions. For, suppose creatures intended for such a particular state of life, for which such propensions were necessary: suppose them endued with such propensions, together with moral understanding, as well including a practical sense of virtue as a speculative perception of it; and that all these several principles, both natural and moral, forming an inward constitution of mind, were in the most exact proportion possible; i.e. in a proportion the most exactly adapted to their intended state of life; such creatures would be made upright, or finitely perfect. Now particular propensions, from their very nature, must be felt, the objects of them being present; though they cannot be gratified at all, or not with the allowance of the moral principle. If they can be gratified without its allowance, or by contradicting it, then they must be conceived to have some tendency, in how low a degree soever, yet some tendency, to induce persons to such forbidden gratification. This tendency, in some one particular propension, may be increased, by the greater frequency of occasions naturally exciting it, than of occasions exciting others. The least voluntary indulgence in forbidden circumstances,[99] though but in thought, will increase this wrong tendency; and may increase it further, till, peculiar conjunctures perhaps conspiring, it becomes effect; and danger of deviating from right, ends in actual deviation from it; a danger necessarily arising from the very nature of propension, and which therefore could not have been prevented, though it might have been escaped, or got innocently through. The case would be, as if we were to suppose a straight path marked out for a person, in which a certain degree of attention would keep him steady: but if he would not attend, in this degree, any one of a thousand objects, catching his eye, might lead him out of it.

Now it is impossible to say, how much even the first full overt act of irregularity might disorder the inward constitution; unsettle the adjustments, and alter the proportions, which formed it, and in which the uprightness of its make consisted: but repetition of irregularities would produce habits. Thus the constitution would be spoiled; and creatures made upright, become corrupt and depraved in their settled character, proportionably to their repeated irregularities in occasional acts,[100] On the contrary, these creatures might have improved and raised themselves, to a higher and more secure state of virtue, by the contrary behavior: by steadily following the moral principle, supposed to be one part of their nature: and thus withstanding that unavoidable danger of defection, which necessarily arose from propension, the other part of it. For, by thus preserving their integrity for some time, their danger would lessen; since propensions, by being inured to submit, would do it more easily and of course: and their security against this lessening danger would increase; since the moral principle would gain additional strength by exercise: both which things are implied in the notion of virtuous habits.

Thus vicious indulgence is not only criminal in itself, but also depraves the inward constitution and character. And virtuous self-government is not only right in itself, but also improves the inward constitution or character: and may improve it to such a degree, that though we should suppose it impossible for particular affections to be absolutely coincident with the moral principle; and consequently should allow, that such creatures as have been above supposed, would forever remain defectible, yet their danger of actually deviating from right may be almost infinitely lessened, and they fully fortified against what remains of it; if that may be called danger, against which there is an adequate, effectual security. Still, this their higher perfection may continue to consist in habits of virtue formed in a state of discipline, and this their more complete security remain to proceed from them.

Thus it is plainly conceivable, that creatures without blemish, as they came out of the hands of God, may be in danger of going wrong; and so may stand in need of the security of virtuous habits, additional to the moral principle wrought into their natures by him. That which is the ground of their danger, or their want of security, maybe considered as a deficiency in themselves, to which virtuous habits are the natural supply. And as they are naturally capable of being raised and improved by discipline, it may be a thing fit and requisite, that they should be placed in circumstances with an eye to it: in circumstances peculiarly fitted to be to them a state of discipline for their improvement in virtue.

But how much more strongly must this hold with respect to those who have corrupted their natures, are fallen from their original rectitude, and whose passions are become excessive by repeated violations of their inward constitution! Upright creatures may want to be improved: depraved creatures want to be renewed. Education and discipline, which may be in all degrees and sorts of gentleness and of severity, are expedient for those: but must be absolutely necessary for these. For these, discipline of the severer sort too, and in the higher degrees of it, must be necessary, in order to wear out vicious habits; to recover their primitive strength of self-government, which indulgence must have weakened; to repair, as well as raise into a habit, the moral principle, in order to their arriving at a secure state of virtuous happiness.

Whoever will consider the thing, may clearly see that the present world is peculiarly fit to be a state of discipline for this purpose, to such as will set themselves to mend and improve. For, the various temptations with which we are surrounded; our experience of the deceits of wickedness; having been in many instances led wrong ourselves; the great viciousness of the world; the infinite disorders consequent upon it; our being made acquainted with pain and sorrow, either from our own feeling of it, or from the sight of it in others; these things, though some of them may indeed produce wrong effects upon our minds, yet when duly reflected upon, have, all of them, a direct tendency to bring us to a settled moderation and reasonableness of temper: the contrary both to thoughtless levity, and also to that unrestrained self-will, and violent bent to follow present inclination, which may be observed in undisciplined minds.

Such experience, as the present state affords, of the frailty of our nature; of the boundless extravagance of ungoverned passion; of the power which an infinite being has over us, by the various capacities of misery which he has given us; in short, that kind and degree of experience, which the present state affords us, that the constitution of nature is such as to admit the possibility, the danger, and the actual event, or creatures losing their innocence and happiness, and becoming vicious and wretched; has a tendency to give us a practical sense of things very different from a mere speculative knowledge, that we are liable to vice, and capable of misery. And who knows, whether the security of creatures in the highest and most settled state of perfection, may not in part arise, from their having had such a sense of things as this, formed, and habitually fixed within them, in some state of probation. And passing through the present world with that moral attention, which is necessary to the acting a right part in it, may leave everlasting impressions of this sort upon our minds.

To be a little more distinct: allurements to what is wrong, difficulties in the discharge of our duty, our not being able to act a uniform right part without some thought and care, and the opportunities which we have, or imagine we have, of avoiding what we dislike or obtaining what we desire, by unlawful means, when we either cannot do it at all, or at least not so easily, by lawful ones, these things, i.e. the snares and temptations of vice, are what render the present world peculiarly fit to be a state of discipline, to those who will preserve their integrity: because they render being upon our guard, resolution, and the denial of our passions, necessary in order to that end. The exercise of such particular recollection, intention of mind, and self-government, in the practice of virtue, has, from the make of our nature, a peculiar tendency to form habits of virtue; as implying, not only a real, but also a more continued, and a more intense exercise of the virtuous principle, or a more constant and a stronger effort of virtue exerted into act. Thus suppose a person to know himself to be in particular danger, for some time, of doing any thing wrong, which yet he fully resolves not to do; continued recollection and keeping upon his guard, in order to make good his resolution, is a continued exerting of that act of virtue in a high degree, which need have been, and perhaps would have been, only instantaneous and weak, had the temptation been so.

It is indeed ridiculous to assert, that self-denial is essential to virtue and piety:[101] but it would have been nearer the truth, though not strictly the truth itself, to have said, that it is essential to discipline and improvement. For though actions materially virtuous, which have no sort of difficulty, but are perfectly agreeable to our particular inclinations, may possibly be done only from these particular inclinations, and so may not be any exercise of the principle of virtue, i.e. not be virtuous actions at all; yet, on the contrary, they may be an exercise of that principle: and when they are, they have a tendency to form and fix the habit of virtue. But when the exercise of the virtuous principle is more continued, oftener repeated, and more intense; as it must be in circumstances of danger, temptation, and difficulty, of any kind and in any degree; this tendency is increased proportionably, and a more confirmed habit is the consequence.