Where the interests of the individual and of the society clash, society, that is to say, a man's fellow-citizens, usually approves, as we saw in the last chapter, of the sacrifice of individual to social interests, a course of conduct which is also, on reflexion, usually stamped by the individual's own approbation, and hence we may say briefly that their tendency to promote or impair the welfare of society is the test by which, in different ways, all actions are estimated alike by the philosopher, in his hours of speculation, and by the community at large, in the practical work of life. In laying down the principle that the presumption of the moralist should always be in favour of existing rules of conduct, I intimated that there was one exception to this principle. The exception includes all those cases which are legitimate, though not obvious, applications of existing rules, and to which, therefore, the ordinary moral sentiment does not attach in the same way that it does to the plainer and more direct applications. Thus, if it can be shewn, as it undoubtedly can be, that smuggling falls under the head of stealing, and holding out false hopes under that of lying, the moralist need take no account of the lax moral sentiment which exists with regard to these practices, though, of course, in estimating the guilt of the individual as distinct from the character of the act, due allowance must be made for his imperfect appreciation of the moral bearings of his conduct. This exception, as will be found in the next chapter, covers, and therefore at once justifies, a large proportion of the criticisms which, in the present advanced stage of morality, when the more fundamental principles have been already settled, it is still open to us to make.