The effect of custom with relation to a specific habit, is displayed through all its varieties in the use of tobacco. The taste of this plant is at first extremely unpleasant. Our disgust lessens gradually till it vanish altogether; at which period the plant is neither agreeable nor disagreeable. Continuing the use, we begin to relish it; and our relish increases by use till it come to its utmost extent. From this state it gradually decays, while the habit becomes stronger and stronger, and consequently the pain of want. The result is, that when the habit has acquired its greatest vigor, the pleasure of gratification is gone. And hence it is, that we often smoke and take snuff habitually, without so much as being conscious of the operation. We must except gratification after the pain of want; because gratification in that case is at the height when the habit is strongest. It is of the same kind with the joy one feels upon being delivered from the rack, the cause of which is explained above[31]. This pleasure however is but occasionally the effect of habit; and however exquisite, is guarded against as much as possible, by preventing want.
With regard to the pain of want, I can discover no difference betwixt a generic and specific habit: the pain is the same in both. But these habits differ widely with respect to the positive pleasure. I have had occasion to observe, that the pleasure of a specific habit decays gradually till it become imperceptible. Not so the pleasure of a generic habit. So far as I can discover, this pleasure suffers little or no decay after it comes to its height. The variety of gratification preserves it entire. However it may be with other generic habits, the observation I am certain holds with respect to the pleasures of virtue and of knowledge. The pleasure of doing good has such an unbounded scope, and may be so variously gratified, that it can never decay. Science is equally unbounded; and our appetite for knowledge has an ample range of gratification, where discoveries are recommended by novelty, by variety, by utility, or by all of them.
Here is a large field of facts and experiments, and several phenomena unfolded, the causes of which have been occasionally suggested. The efficient cause of the power of custom over man, a fundamental point in the present chapter, has unhappily evaded my keenest search; and now I am reduced to hold it an original branch of the human constitution, though I have no better reason for my opinion, than that I cannot resolve it into any other principle. But with respect to the final cause, a point of still greater importance, I promise myself more success. It cannot indeed have escaped any thinking person, that the power of custom is a happy contrivance for our good. Exquisite pleasure produceth satiety: moderate pleasure becomes stronger by custom. Business is our province, and pleasure our relaxation only. Hence, satiety is necessary to check exquisite pleasures, which otherwise would ingross the mind, and unqualify us for business. On the other hand, habitual increase of moderate pleasure, and even conversion of pain into pleasure, are admirably contrived for disappointing the malice of Fortune, and for reconciling us to whatever course of life may be our lot:
How use doth breed a habit in a man!
This shadowy desert, unfrequented woods,
I better brook than flourishing peopled towns.
Here I can sit alone, unseen of any,
And to the nightingale’s complaining notes
Tune my distresses, and record my woes.
Two Gentlemen of Verona, act 5. sc. 4.
The foregoing distinction betwixt intense and moderate, holds in pleasure only, not in pain, every degree of which is softened by time and custom. Custom is a catholicon for pain and distress of every sort; and of this regulation the final cause is so evident as to require no illustration.
Another final cause of custom will be highly relished by every person of humanity; and yet has in a great measure been overlooked. Custom hath a greater influence than any other known principle, to put the rich and poor upon a level. Weak pleasures, which fall to the share of the latter, become fortunately stronger by custom; while voluptuous pleasures, the lot of the former, are continually losing ground by satiety. Men of fortune, who possess palaces, sumptuous gardens, rich fields, enjoy them less than passengers do. The goods of Fortune are not unequally distributed: the opulent possess what others enjoy.
And indeed, if it be the effect of habit to produce the pain of want in a high degree while there is little pleasure in enjoyment, a voluptuous life is of all the least to be envied. Those who are accustomed to high feeding, easy vehicles, rich furniture, a crowd of valets, much deference and flattery, enjoy but a small share of happiness, while they are exposed to manifold distresses. To such a man, inslaved by ease and luxury, even the petty inconveniencies of a rough road, bad weather, or homely fare on a journey, are serious evils. He loses his tone of mind, becomes peevish, and would wreak his resentment even upon the common accidents of life. Better far to use the goods of Fortune with moderation. A man who by temperance and activity has acquired a hardy constitution, is, on the one hand, guarded against external accidents, and is, on the other, provided with great variety of enjoyment ever at command.
I shall close this chapter with the discussion of a question more delicate than abstruse, viz. What authority custom ought to have over our taste in the fine arts? It is proper to be premised, that we chearfully abandon to its authority every thing that nature leaves to our choice, and where the preference we bestow has no foundation other than whim or fancy. There appears no original difference betwixt the right and the left hand: custom however has established a difference, so as to make it aukward and disagreeable to use the left where the right is commonly used. The various colours, though they affect us differently, are all of them agreeable in their purity. But custom has regulated this matter in another manner: a black skin upon a human creature, is to us disagreeable; and a white skin probably not less so to a negro. Thus things originally indifferent, become agreeable or disagreeable by the force of custom. Nor ought this to be surprising after the discovery made above, that the original agreeableness or disagreeableness of an object, is, by the influence of custom, often converted into the opposite quality.
Concerning now those matters of taste where there is naturally a preference of one thing before another; it is certain, in the first place, that our faint and more delicate feelings are readily susceptible of a bias from custom; and therefore that it is no proof of a defective taste, to find these in some measure under the government of custom. Dress, and the modes of external behaviour, are justly regulated by custom in every country. The deep red or vermilion with which the ladies in France cover their cheeks, appears to them beautiful in spite of nature; and strangers cannot altogether be justified in condemning this practice, considering the lawful authority of custom, or of the fashion, as it is called. It is told of the people who inhabit the skirts of the Alps facing the north, that the swelling they universally have in the neck is to them agreeable. So far has custom power to change the nature of things, and to make an object originally disagreeable take on an opposite appearance.
But as to the emotions of propriety and impropriety, and in general as to all emotions involving the sense of right or wrong, custom has little authority, and ought to have none at all. Emotions of this kind, being qualified with the consciousness of duty, take naturally place of every other feeling; and it argues a shameful weakness or degeneracy of mind, to find them in any case so far subdued as to submit to custom.