(3) That the criterion of Good is current convention. To which it is replied, that conventions are always changing, and that the moral reformer is precisely the man who disputes those which are current. Especially, it is urged that our own conventions are, in fact, vigorously challenged, e.g. by Nietzsche. (4) That the criterion of Good is Pleasure, or the "greatest happiness of the greatest number." To which it is replied: (a) That this view is not, as is commonly urged, in accordance with 'common sense.' (b) That either Pleasure must be taken in the simplest and narrowest sense; in which case it is palpably inadequate as a criterion of Good; or its meaning must be so widely extended that the term Pleasure becomes as indefinite as the term Good. (c) That if the criterion of Pleasure were to be fairly applied, it would lead to results that would shock those who profess to adopt it. III. These methods of determining Good having been set aside, it is suggested that it is only by 'interrogating experience' that we can discover, tentatively, what things are good. To this it is objected, that perhaps all our ideas derived from experience are false, and that the only method of determining Good would be metaphysical, and _a priori_. In reply, the bare possibility of such a method is admitted; but it is urged that no one really believes that all our opinions derived from experience are false, and that such a belief, if held, would deprive life of all ethical significance and worth. Finally, it is suggested that the position in which we do actually find ourselves, is that of men who have a real, though imperfect perception of a real Good, and who are endeavouring, by practice, to perfect that perception. In this respect an analogy is drawn between our perception of Good and our perception of Beauty. It is further suggested that the end of life is not merely a knowledge but an experience of Good; this end being conceived as one to be realised in Time. IV. On this, the point is raised, whether it is not necessary to conceive Good as eternally existing, rather than as something to be brought into existence in the course of Time? On this view, Evil must be conceived as mere 'appearance.' In reply, it is suggested: (1) That it is impossible to reconcile the conception of eternal Good with the obvious fact of temporal Evil. (2) That such a view reduces to an absurdity all action directed to ends in Time. And yet it seems that such action not only is but ought to be pursued, as appears to be admitted even by those who hold that Good exists eternally, since they make it an end of action that they should come to see that everything is good. (3) That this latter conception of the end of action--namely, that we should bring ourselves to see that what appears to be Evil is really Good--is too flagrantly opposed to common sense to be seriously accepted. To sum up: In this Book the following positions have been discussed and rejected: