§5. If, then, we may assume the existence of such a Being, as God, by the consensus of theologians, is conceived to be, it seems that Utilitarians may legitimately infer the existence of Divine sanctions to the code of social duty as constructed on a Utilitarian basis; and such sanctions would, of course, suffice to make it always every one's interest to promote universal happiness to the best of his knowledge. It is, however, desirable, before we conclude, to examine carefully the validity of this assumption, in so far as it is supported on ethical grounds alone. For by the result of such an examination will be determined, as we now see, the very important question whether ethical science can be constructed on an independent basis; or whether it is forced to borrow a fundamental and indispensable premiss from Theology or some similar source. In order fairly to perform this examination, let us reflect upon the clearest and most certain of our moral intuitions. I find that I undoubtedly seem to perceive, as clearly and certainly as I see any axiom in Arithmetic or Geometry, that it is `right' and `reasonable' for me to treat others as I should think that I myself ought to be treated under similar conditions, and to do what I believe to be ultimately conducive to universal Good or Happiness. But I cannot find inseparably connected with this conviction, and similarly attainable by mere reflective intuition, any cognition that there actually is a Supreme Being who will adequately reward me for obeying these rules of duty, or punish me for violating them. Or,---omitting the strictly theological element of the proposition,---I may say that I do not find in my moral consciousness any intuition, claiming to be clear and certain, that the performance of duty will be adequately rewarded and its violation punished. I feel indeed a desire, apparently inseparable from the moral sentiments, that this result may be realised not only in my own case but universally; but the mere existence of the desire would not go far to establish the probability of its fulfilment, considering the large proportion of human desires that experience shows to be doomed to disappointment. I also judge that in a certain sense this result ought to be realised: in this judgment, however, I ought is not used in a strictly ethical meaning; it only expresses the vital need that our Practical Reason feels of proving or postulating this connexion of Virtue and self-interest, if it is to be made consistent with itself. For the negation of the connexion must force us to admit an ultimate and fundamental contradiction in our apparent intuitions of what is Reasonable in conduct; and from this admission it would seem to follow that the apparently intuitive operation of the Practical Reason, manifested in these contradictory judgments, is after all illusory.
I do not mean that if we gave up the hope of attaining a practical solution of this fundamental contradiction, through any legitimately obtained conclusion or postulate as to the moral order of the world, it would become reasonable for us to abandon morality altogether: but it would seem necessary to abandon the idea of rationalising it completely. We should doubtless still, not only from self-interest, but also through sympathy and sentiments protective of social wellbeing, imparted by education and sustained by communication with other men, feel a desire for the general observance of rules conducive to general happiness; and practical reason would still impel us decisively to the performance of duty in the more ordinary cases in which what is recognised as duty is in harmony with self-interest properly understood. But in the rarer cases of a recognised conflict between self-interest and duty, practical reason, being divided against itself, would cease to be a motive on either side; the conflict would have to be decided by the comparative preponderance of one or other of two groups of non-rational impulses.
If then the reconciliation of duty and self-interest is to be regarded as a hypothesis logically necessary to avoid a fundamental contradiction in one chief department of our thought, it remains to ask how far this necessity constitutes a sufficient reason for accepting this hypothesis. This, however, is a profoundly difficult and controverted question, the discussion of which belongs rather to a treatise on General Philosophy than to a work on the Methods of Ethics: as it could not be satisfactorily answered, without a general examination of the criteria of true and false beliefs. Those who hold that the edifice of physical science is really constructed of conclusions logically inferred from self-evident premises, may reasonably demand that any practical judgments claiming philosophic certainty should be based on an equally firm foundation. If on the other band we find that in our supposed knowledge of the world of nature propositions are commonly taken to be universally true, which yet seem to rest on no other grounds than that we have a strong disposition to accept them, and that they are indispensable to the systematic coherence of our beliefs,---it will be more difficult to reject a similarly supported assumption in ethics, without opening the door to universal scepticism.