Let us consider what it is such philosophers say. And first it is to be noticed that they do not agree among themselves. They not only say that they are right as to what good is, but they endeavour to prove that other people who say that it is something else, are wrong. One, for instance, will affirm that good is pleasure, another, perhaps, that good is that which is desired; and each of these will argue eagerly to prove that other people who say that it is something else, are wrong. One, for instance, will affirm that good is pleasure, another, perhaps, that good is that which is desired; and each of these will argue eagerly to prove that the other is wrong. But how is that possible? One of them says that good is nothing but the object of desire, and at the same time tries to prove that it is not pleasure. But from his first assertion, that good just means the object of desire, one of two things must follow as regards his proof: (§ 11 ¶ 1)

(1) He may be trying to prove that the object of desire is not pleasure. But, if this be all, where is his Ethics? The position he is maintaining is merely a psychological one. Desire is something which occurs in our minds, and pleasure is something else which so occurs; and our would-be ethical philosopher is merely holding that the latter is not the object of the former. But what has that to do with the question in dispute? His opponent held the ethical proposition that pleasure was the good, and although he should prove a million times over the psychological proposition that pleasure is not the object of desire, he is no nearer proving his opponent to be wrong. The position is like this. One man says a triangle is a circle: another replies, A triangle is a straight line, and I will prove to you that I am right: for (this is the only argument) a straight line is not a circle. That is quite true, the other may reply; but nevertheless a triangle is a circle, and you have said nothing whatever to prove the contrary. What is proved is that one of us is wrong, for we agree that a triangle cannot be both a straight line and a circle: but which is wrong, there can be no earthly means of proving, since you define triangle as straight line and I define it as circle.—Well, that is one alternative which any naturalistic Ethics has to face; if good is defined as something else, then it is impossible either to prove that any other definition is wrong or even to deny such definition. (§ 11 ¶ 2)

(2) The other alternative will scarcely be more welcome. It is that the discussion is after all a verbal one. When A says Good means pleasant and B says Good means desired, they may merely wish to assert that most people have used the word for what is pleasant and for what is desired respectively. And this is quite an interesting subject for discussion: only it is not a whit more an ethical discussion than the last was. Nor do I think that any exponent of naturalistic Ethics would be willing to allow that this was all he meant. They are all so anxious to persuade us that what they call the good is what we really ought to do. Do, pray, act so, because the word good is generally used to denote actions of this nature: such, on this view, would be the substance of their teaching. And in so far as they tell us how we ought to act, their teaching is truly ethical, as they mean it to be. But how perfectly absurd is the reason they would give for it! You are to do this, because most people use a certain word to denote conduct such as this. You are to say the thing which is not, because most people call it lying. That is an argument just as good!—My dear sirs, what we want to know from you as ethical teachers, is not how people use a word; it is not even, what kind of actions they approve, which the use of this word good may certainly imply: what we want to know is simply what is good. We may indeed agree that what most people do think good, is actually so; we shall at all events be glad to know their opinions: but when we say that their opinions about what is good, we do mean what we say; we do not care whether they call that thing horse or table or chair, gut or bon or ἀγαθός; we want to know what it is that they so call. When they say Pleasure is good, we cannot believe that they merely mean Pleasure is pleasure and nothing more than that. (§ 11 ¶ 3)