and ought, therefore, never to break it. It is this fact which seems to justify the stringency with which moral rules are usually enforced and sanctioned, and to give a sense in which we may accept as true the maxims that ‘The end never justifies the means’ and ‘That we should never do evil that good may come.’ The ‘means’ and the ‘evil,’ intended by these maxims, are, in fact, the breaking of moral rules generally recognised and practised, and which, therefore, we may assume to be generally useful. Thus understood, these maxims merely point out that, in any particular case, although we cannot clearly perceive any balance of good produced by keeping the rule and do seem to see one that would follow from breaking it, nevertheless the rule should be observed. It is hardly necessary to point out that this is so only because it is certain that, in general, the end does justify the means in question, and that therefore there is a probability that in this case it will do so also, although we cannot see that it will.
But moreover the universal observance of a rule which is generally useful has, in many cases, a special utility, which seems deserving of notice. This arises from the fact that, even if we can clearly discern that our case is one where to break the rule is advantageous, yet, so far as our example has any effect at all in encouraging similar action, it will certainly tend to encourage breaches of the rule which are not advantageous. We may confidently assume that what will impress the imagination of others will not be the circumstances in which our case differs from ordinary cases and which justify our exceptional action, but the points in which it resembles other actions that are really criminal. In cases, then, where example has any influence at all, the effect of an exceptional right action will generally be to encourage wrong ones. And this effect will probably be exercised not only on other persons but on the agent himself. For it is impossible for any one to keep his intellect and sentiments so clear, but that, if he has once approved of a generally wrong action, he will be more likely to approve of it also under other circumstances than those which justified it in the first instance. This inability to discriminate exceptional cases offers, of course, a still stronger
