Just as custom diminishes our sense of the impropriety of' things which we are accustomed to see together, as in the case of absurdity of dress, so familiarity from youth upwards with violence, falsehood, and injustice takes away all sense of the enormity of such conduct; and, on the other hand, when custom and fashion coincide with the principles of right and wrong, they enhance our moral ideas and increase our abhorrence for everything evil. "Those who have been educated in what is really good companynot in what is commonly called suchwho have been accustomed to see nothing in the persons whom they esteemed and lived with but justice, modesty, humanity and good order, are more shocked with whatever seems to be inconsistent with the rules which those virtues prescribe."Custom affords an explanation of the different ideas of good conduct prevalent in different degrees of civilization. For every age and country look upon that degree of each quality which is most usual in those among themselves who are most esteemed as the golden mean of that particular talent or virtue. Their sentiments concerning the degree of each quality that deserves praise or blame vary according to the degree which is most common in their own country and times; thus, that degree of politeness which might be thought effeminate adulation in Russia might be regarded as barbarous rudeness in France.
In general, the style of manners prevalent in any nation is that which is most suitable to its situation. That which is most suitable being, then, that which is naturally most com- mon, different standards arise with regard to the general propriety of behaviour. A savage, in continual danger, or exposed to frequent want, acquires a hardiness of character, an insensibility to the sufferings of himself or others, which is most suitable to the circumstances of his situation, and which affords a very different standard of self-command than that which is either usual or necessary in civilized life. The general security and happiness which prevail in ages of culture, by affording little exercise to contempt of danger, or to the endurance of pain or hunger, enable the virtues which are founded on humanity to be more cultivated than those which are founded on self-denial; so that to complain when in pain, to grieve in distress, to be overcome by love or anger, are not regarded as weaknesses, as they would be in savage life, nor as affecting the essential parts of a man's character.
In the different professions and ages of life the same influence of custom may be traced. In each rank and profession we expect a degree of those manners which experience has taught us to look for in them. As in each species of natural objects we are pleased with the conformity to the general type, so in each species of men we are pleased, "if they have neither too much nor too little of the character which usually accompanies their particular condition and situation." Our approbation of a certain kind of military character is founded entirely on habit; for we are taught by custom to annex to the military profession "the character of gaiety, levity, and sprightly *******, as well as of some degree of dissipation." Whatever behaviour we have been accustomed to see in any order of men, comes to be so associated with that order, that whenever we see the one we expect to see the other, and are pleased or disappointed according as we see it or not. Nevertheless, there may exist a propriety of professional behaviour, independent of the custom which leads us to expect it; and we feel that, apart from all custom, there is a propriety in the gravity of manners which custom has allotted to the profession of a clergyman.
In the same way different manners are assigned to the different periods which mark human life. In youth we look for that sensibility, gaiety, and vivacity which experience teaches us to expect at that age; and at the extreme of life, a certain gravity and sedateness is the character which custom teaches us is both most natural and most respectable.
But nevertheless it is necessary not to exaggerate the effects of custom and fashion on our moral sentiments; for it is more concerning the propriety or impropriety of particular usages than about things of the greatest importance that their in- fluence is most apt to cause perversion of judgment. "We expect truth and justice from an old man as well as from a young, from a clergyman as well as from an officer; and it is in matters of small moment only that we look for the distinguishing marks of their respective characters."No society could subsist a moment if custom could exercise such perversion over our moral sentiments, with regard to the general style of conduct and behaviour, as it exercises with regard to the propriety of particular usages. Uninterrupted custom prevented the philosophers of Athens recognizing the evil of infanticide; and to say that a thing is commonly done is daily offered as an apology for what in itself is the most unjust and unreasonable conduct.
CHAPTER VI.THEORY OF CONSCIENCE AND DUTY.
The theory of Hutcheson, that there exists in mankind an inward moral sense concerned with the direct perception of moral qualities in actions just as the sense of hearing or seeing is concerned with the direct perception of sounds or objects, or the theory of Shaftesbury that what we call conscience is a primary principle of human nature irresoluble into other facts, is very different from the theory of Adam Smith, who refers our moral perceptivity to the workings of the instinct of sympathy.
