native, it seems possible to establish as much as this in defence of most of the rules most universally recognised by Common Sense. I do not propose to enter upon this defence in detail, but merely to point out what seem to be the chief distinct principles by the use of which it can be made.
In the first place, then, we can only shew that one action is generally better than another as a means, provided that certain other circumstances are given. We do, as a matter of fact, only observe its good effects under certain circumstances, and it may be easily seen that a sufficient change in these would render doubtful what seem to be the most universally certain of general rules. Thus, the general disutility of murder can only be proved, provided the majority of the human race will certainly persist in existing. In order to prove that murder, if it were so universally adopted as to cause the speedy extermination of the race, would not be good as a means, we should have to disprove the main contention of pessimism—namely that the existence of human life is on the whole an evil. And the view of pessimism, however strongly we may be convinced of its truth or falsehood, is one which never has been either proved or refuted conclusively. That universal murder would not be a good thing at this moment can therefore not be proved. But, as a matter of fact, we can and do assume with certainty that, even if a few people are willing to murder, most people will not be willing. When, therefore, we say that murder is in general to be avoided, we only mean that it is so, so long as the majority of mankind will certainly not agree to it, but will persist in living. And that, under these circumstances, it is generally wrong for any single person to commit murder seems capable of proof. For, since there is in any case no hope of exterminating the race, the only effects which we have to consider are those which the action will have upon the increase of the goods and the diminution of the evils of human life. Where the best is not attainable (assuming extermination the best) one alternative may still be better than another. And, apart from the immediate evils which murder generally produces, the fact that, if it were common practice, the feeling of insecurity, thus caused, would
