Let us consider this doctrine. Bentham seems to imply, so Prof. Sidgwick says, that the word “right” means “conducive to general happiness.” Now this, by itself, need not necessarily involve the naturalistic fallacy. For the word “right” is very commonly appropriated to actions which lead to the attainment of what is good; which are regarded as means to the ideal and not as ends-in-themselves. This use of “right,” as denoting what is good as a means, whether or not it be also good as an end, is indeed the use to which I shall confine the word. Had Bentham been using “right” in this sense, it might be perfectly consistent for him to define right as “conducive to the general happiness,” provided only (and notice this proviso) he had already proved, or laid down as an axiom, that general happiness was the good, or (what is equivalent to this) that general happiness alone was good. For in that case he would have already defined the good as general happiness (a position perfectly consistent, as we have seen, with the contention that “good” is indefinable), and, since right was to be defined as “conducive to the good,” it would actually mean “conducive to general happiness.” But this method of escape from the charge of having committed the naturalistic fallacy has been closed by Bentham himself. For his fundamental principle is, we see, that the greatest happiness of all concerned is the right and proper end of human action. He applies the word “right,” therefore, to the end, as such, not only to the means which are conducive to it; and, that being so, right can no longer be defined as “conducive to the general happiness,” without involving the fallacy in question. For now it is obvious that the definition of right as conducive to general happiness can be used by him in support of the fundamental principle that general happiness is the right end; instead of being itself derived from that principle. If right, by definition, means conducive to general happiness, then it is obvious that general happiness is the right end. It is not necessary now first to prove or assert that general happiness is the right end, before right is defined as conducive to general happiness—a perfectly valid procedure; but on the contrary the definition of right as conducive to general happiness proves general happiness to be the right end—a perfectly invalid procedure, since in this case the statement that “general happiness is the right end of human action” is not an ethical principle at all, but either, as we have seen, a proposition about the meaning of words, or else a proposition about the nature of general happiness, not about its rightness or goodness.
Now, I do not wish the importance I assign to this fallacy to be misunderstood. The discovery of it does not at all refute Bentham’s contention that greatest happiness is the proper end of human action, if that be understood as an ethical proposition, as he undoubtedly intended it. That principle may be true all the same; we shall consider whether it is so in succeeding chapters. Bentham might have maintained it, as Professor Sidgwick does, even if the fallacy had been pointed out to him. What I am maintaining is that the reasons which he actually gives for his ethical proposition are fallacious ones so far as they consist in a definition of right. What I suggest is that he did not perceive them to be fallacious; that, if he had done so, he would have been led to seek for other reasons in support of his Utilitarianism; and that, had he sought for other reasons, he might have found none which he thought to be sufficient. In that case he would have changed his whole system—a most important consequence. It is undoubtedly also possible that he would have thought other reasons to be sufficient, and in that case his ethical system, in its main results, would still have stood. But, even in this latter case, his use of the fallacy would be a serious objection to him as an ethical philosopher. For it is the business of Ethics, I must insist, not only to obtain true results, but also to find valid reasons for them. The direct object of Ethics is knowledge and not practice; and anyone who uses the naturalistic fallacy has certainly not fulfilled this first object, however correct his practical principles may be.
My objections to Naturalism are then, in the first place, that it offers no reason at all, far less any valid reason, for any ethical principle whatever; and in this it already fails to satisfy the requirements of Ethics, as a scientific study. But in the second place I contend that, though it gives a reason for no ethical principle, it is a cause of the acceptance of false principles—it deludes the mind into accepting ethical principles, which are false; and in this it is contrary to every aim of Ethics. It is easy to see that if we start with a definition of right conduct as conduct conducive to general happiness; then, knowing that right conduct is universally conduct conducive to
