In his Metaphysische Anfangsgründe der Tugendlehre this pendant to the deplorable Rechtslehre, written in 1797, the debility of old age is at length fully pre-ponderant. For all these reasons the present criticism will mainly deal with the treatise first mentioned, viz., the Grundlegung zur Metaphysik der Sitten, and the reader will please understand that all the page numbers given by themselves refer to it. Both the other works will only be considered as accessory and secondary. For a proper comprehension of the present criticism, which, in probing the Kantian Ethics to its depths, bears directly and principally on this Grundlegung, it is very desirable that the latter be carefully read through again, so that the mind may have a perfectly clear and fresh presentment of what it contains. It is but a matter of 128 and xiv pages (in Rosenkranz only 100 pages altogether). I shall quote from the third edition of 1792, adding the page number of the new complete publication by Rosenkranz, with an R. prefixed.
[1] For a complete demonstration v. Die Welt als Wille und Vorstellung, Vol. I., § 16, p. 103, sqq., and Vol. II., Chap. 16, p. 166, sqq. of the third edition. Die Welt als Wille und Vorstellung, that is, The World as Will and Idea; "Idea" being used much as εἵδωλον sometimes is (cf. Xen. Sym., 4, 21), in the sense of "an image in the mind," "a mental picture."—(Translator.)
[2] It seems better to keep this technical word than to attempt a cumbrous periphrasis. The meaning is perfectly clear. The sensibilia (phaenomena) are opposed to the intelligibilia (noumena), which compose the transcendental world. So the individual, in so far as he is a phaenomenon, has an empirical character; in so far as he is a noumenôn, his character is intelligible (intelligibilis). The mundus intelligibilis, or mundus noumenôn is the κόσμος νοητὸς of New Platonism.—(Translator.)
[3] It was published in 1785: The Kritik der Reinen Vernunft, first edition, in 1781.—(Translator.)
[4] His analysis is really derived from myself, but in this place I am speaking incognito.
CHAPTER II.
ON THE IMPERATIVE FORM OF THE KANTIAN ETHICS.
Kant's πρῶτον ψεῡδος (first false step) lies in his conception of Ethics itself, and this is found very clearly expressed on page 62 (R., p. 54): "In a system of practical philosophy we are not concerned with adducing reasons for that which takes place, but with formulating laws regarding that which ought to take place, even if it never does take place." This is at once a distinct petitio principii. Who tells you that there are laws to which our conduct ought to be subject? Who tells you that that ought to take place, which in fact never does take place? What justification have you for making this assumption at the outset, and consequently for forcing upon us, as the only possible one, a system of Ethics couched in the imperative terms of legislation? I say, in contradistinction to Kant, that the student of Ethics, and no less the philosopher in general, must content himself with explaining and interpreting that which is given, in other words, that which really is, or takes place, so as to obtain an understanding of it, and I maintain furthermore that there is plenty to do in this direction, much more than has hitherto been done, after the lapse of thousands of years. Following the above petitio principii, Kant straightway, without any previous investigation, assumes in the preface (which is entirely devoted to the subject), that purely moral laws exist; and this assumption remains thenceforth undisturbed, and forms the very foundation of his whole system. We, however, prefer first of all to examine the conception denoted by the word "law." The true and original meaning of the term is limited to law as between citizens; it is the lex, νόμος, of the Romans and Greeks, a human institution, and depending on human volition. It has a secondary, derived, figurative, metaphorical meaning, when applied to Nature, whose operations, partly known a priori, partly learnt by experience, and which are always constant, we call natural laws. Only a very small portion of these natural laws can be discerned a priori, and with admirable acuteness, Kant set them apart, and classed them under the name "Metaphysics of Nature." There is also undoubtedly a law for the human will, in so far as man belongs to Nature; and this law is strictly provable, admits of no exception, is inviolable, and immovable as the mountains, and does not, like the Categorical Imperative, imply a quasi-necessity, but rather a complete and absolute one. It is the law of motivation, a form of the law of causation; in other words, it is the causation which is brought about by the medium of the understanding. It is the sole demonstrable law to which the human will as such is subject. It means that every action can only take place in consequence of a sufficient motive. Like causality in general, it is a natural law. On the other hand, moral laws, apart from human institution, state ordinance, or religious doctrine, cannot rightly be assumed as existing without proof. Kant, therefore, by taking such laws for granted, is guilty of a petitio principii, which is all the bolder, in that he at once adds (page vi of the preface) that a moral law ought to imply "absolute necessity." But "absolute necessity" is everywhere characterised by an inevitable chain of consequence; how, then, can such a conception be attached to these alleged moral laws (as an instance of which he adduces "thou shalt not lie"[1])? Every one knows, and he himself admits, that no such consecution for the most part takes place; the reverse, indeed, is the rule.
In scientific Ethics before we admit as controlling the will other laws besides that of motivation-laws which are original and independent of all human ordinance—we must first prove and deduce their existence; that is, provided in things ethical we are concerned not merely with recommending honesty, but with practising it. Until that proof be furnished, I shall recognise only one source to which is traceable the importation into Ethics of the conception Law, Precept, Obligation. It is one which is foreign to philosophy. I mean the Mosaic Decalogue. Indeed the spelling "du sollt"[2] in the above instance of a moral law, the first put forward by Kant, naïvely betrays this origin. A conception, however, which can\ point to no other source than this, has no right, without undergoing further scrutiny, thus to force its way into philosophical Ethics. It will be rejected, until introduced by duly accredited proof. Thus on the threshold of the subject Kant makes his first petitio principii, and that no small one.
Our philosopher, then, by begging the question in his preface, simply assumes the conception of Moral Law as given and existing beyond all doubt; and he treats the closely related conception of Duty (page 8, R., p. 16) exactly in the same way. Without subjecting it to any further test, he admits it forthwith as a proper appurtenance of Ethics. But here, again, I am compelled to enter a protest. This conception, equally with the kindred notions of Law, Command, Obligation, etc., taken thus unconditionally, has its source in theological morals, and it will remain a stranger to philosophical morals, so long as it fails to furnish sufficient credentials drawn either from man's nature, or from the objective world. Till then, I can only recognise the Decalogue as the origin of all these connected conceptions. Since the rise of Christianity there is no doubt that philosophical has been unconsciously moulded by theological ethics. And since the latter is essentially dictatorial, the former appears in the shape of precepts and inculcation of Duty, in all innocence, and without any suspicion that first an ulterior sanction is needful for this rôle; rather does she suppose it to be her proper and natural form. It is true that all peoples, ages, and creeds, and indeed all philosophers (with the exception of the materialists proper) have undeniably recognised that the ethical significance of human conduct is a metaphysical
