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On the other hand the question, how the imperative of morality is
possible, is undoubtedly one, the only one? demanding a solution, as
this is not at all hypothetical, and the objective necessity which
it presents cannot rest on any hypothesis, as is the case with the
hypothetical imperatives. Only here we must never leave out of
consideration that we cannot make out by any example, in other words
empirically, whether there is such an imperative at all; but it is
rather to be feared that all those which seem to be categorical may
yet be at bottom hypothetical. For instance, when the precept is:
Thou shalt not promise deceitfully; and it is assumed that the
necessity of this is not a mere counsel to avoid some other evil, so
that it should mean: thou shalt not make a lying promise, lest if it
become known thou shouldst destroy thy credit, but that an action of
this kind must be regarded as evil in itself, so that the imperative
of the prohibition is categorical; then we cannot show with
certainty in any example that the will was determined merely by the
law, without any other spring of action, although it may appear to
be so. For it is always possible that fear of disgrace, perhaps also
obscure dread of other dangers, may have a secret influence on the
will. Who can prove by experience the non-existence of a cause when
all that experience tells us is that we do not perceive it? But in
such a case the so-called moral imperative, which as such appears to
be categorical and unconditional, would in reality be only a
pragmatic precept, drawing our attention to our own interests, and
merely teaching us to take these into consideration.
We shall therefore have to investigate a priori the possibility of a
categorical imperative, as we have not in this case the advantage of
its reality being given in experience, so that [the elucidation of]
its possibility should be requisite only for its explanation, not
for its establishment. In the mean-time it may be discerned
beforehand that the categorical imperative alone has the purport of
a practical law: all the rest may indeed be called principles of the
will but not laws, since whatever is only necessary for the
attainment of some arbitrary purpose may be considered as in itself
contingent, and we can at any time be free from the precept if we
give up the purpose: on the contrary, the unconditional command
leaves the will no liberty to choose the opposite; consequently it
alone carries with it that necessity which we require in a law.
Secondly, in the case of this categorical imperative or law of
morality, the difficulty (of discerning its possibility) is a very
profound one. It is an a priori synthetical practical proposition;
[Footnote: I connect the act with the will without presupposing any
condition resulting from any inclination, but d priori, and
therefore necessarily (though only objectively, i. e. assuming the
idea of a reason possessing full power over all subjective motives).
This is accordingly a practical proposition which does not deduce
the willing of an action by mere analysis from another already
presupposed (for we have not such a perfect will), but connects it
immediately with the conception of the will of a rational being, as
something not contained in it.] and as there is so much difficulty
in discerning the possibility of speculative propositions of this
kind, it may readily be supposed that the difficulty will be no less
with the practical.
In this problem we will first inquire whether the mere conception of
a categorical imperative may not perhaps supply us also with the
formula of it, containing the proposition which alone can be a
categorical imperative; for even if we know the tenor of such
absolute command, yet how it is possible will require further
special and laborious study, which we postpone to the last section.
When I conceive a hypothetical imperative in general I do not know
beforehand what it will contain until I am given the condition. But
when I conceive a categorical imperative I know at once what it
contains. For as the imperative contains besides the law only the
necessity that the maxims [Footnote: A MAXIM is a subjective
principle of action, and must be distinguished from the objective
principle, namely, practical law. The former contains the practical
rule set by reason according to the conditions of the subject (often
its ignorance or its inclinations), so that it is the principle on
which the subject acts; but the law is the objective principle valid
for every rational being, and is the principle on which it ought to
act that is an imperative.] shall conform to this law, while the law
contains no conditions restricting it, there remains nothing but the
general statement that the maxim of the action should conform to a
universal law, and it is this conformity alone that the imperative
properly represents as necessary. [Footnote: I have no doubt that
"den" in the original before "Imperativ" is a misprint for "der,"
and have translated accordingly. Mr. Semple has done the same. The
editions that I have seen agree in reading "den," and M. Barni so
translates. With this reading, it is the conformity that presents
the imperative as necessary.]
There is therefore but one categorical imperative, namely this: Act
only on that maxim whereby thou canst at the same time will that it
should become a universal law.
Now if all imperatives of duty can be deduced from this one
imperative as from their principle, then, although it should remain
undecided whether what is called duty is not merely a vain notion,
yet at least we shall be able to show what we understand by it and
what this notion means.
Since the universality of the law according to which effects are
produced constiutes what is properly called nature in the most
general sense (as to form), that is the existence of things so far
as it is determined by general laws, the imperative of duty may be
expressed thus: Act as if the maxim of thy action were to become by
thy will a Universal Law of Nature.
We will now enumerate a few duties, adopting the usual division of
them into duties to ourselves and to others, and into perfect and
imperfect duties. [Footnote: It must be noted here that I reserve
the division of duties for a future metaphysic of morals; so that I
give it here only as an arbitrary one (in order to arrange my
examples). For the rest, I understand by a perfect duty one that
admits no exception in favour of inclination, and then I have not
merely external, but also internal perfect duties. This is contrary
to the use of the word adopted in the schools; but I do not intend
to justify it here, as it is all one for my purpose whether it is
admitted or not. [Perfect duties are usually understood to be those
which can be enforced by external law; imperfect, those which cannot
be enforced. They are also called respectively determinate and
indeterminate, officia juris and officia virtutis.]]
I. A man reduced to despair by a series of misfortunes feels wearied
of life, but is still so far in possession of his reason that he can
ask himself whether it would not be contrary to his duty to himself
to take his own life. Now he inquires whether the maxim of his
action could become a universal law of nature. His maxim is: From
self-love I adopt it as a principle to shorten my life when its
longer duration is likely to bring more evil than satisfaction. It
is asked then simply whether this principle founded on self-love can
become a universal law of nature. Now we see at once that a system
of nature of which it should be a law to destroy life by means of
the very feeling whose special nature it is to impel to the
improvement of life would contradict itself, and therefore could not
exist as a system of nature; hence that maxim cannot possibly exist
as a universal law of nature, and consequently would be wholly
inconsistent with the supreme principle of all duty. [Footnote: On
suicide cf. further Metaphysik der Sitten, p. 274.]
2. Another finds himself forced by necessity to borrow money. He
knows that he will not be able to repay it, but sees also that
nothing will be lent to him, unless he promises stoutly to repay it
in a definite time. He desires to make this promise, but he has
still so much conscience as to ask himself: Is it not unlawful and
inconsistent with duty to get out of a difficulty in this way?
Suppose, however, that he resolves to do so, then the maxim of his
action would be expressed thus: When I think myself in want of
money, I will borrow money and promise to repay it, although I know
that I never can do so. Now this principle of self-love or of one's
own advantage may perhaps be consistent with my whole future
welfare; but the question now is, Is it right? I change then the
suggestion of self-love into a universal law, and state the question
thus: How would it be if my maxim were a universal law? Then I see
at once that it could never hold as a universal law of nature, but
would necessarily contradict itself. For supposing it to be a
universal law that everyone when he thinks himself in a difficulty
should be able to promise whatever he pleases, with the purpose of
not keeping his promise, the promise itself would become impossible,
as well as the end that one might have in view in it, since no one
would consider that anything was promised to him, but would ridicule
all such statements as vain pretences.
3. A third finds in himself a talent which with the help of some
culture might make him a useful man in many respects. But he finds
himself in comfortable circumstances, and prefers to indulge in
pleasure rather than to take pains in enlarging and improving his
happy natural capacities. He asks, however, whether his maxim of
neglect of his natural gifts, besides agreeing with his inclination
to indulgence, agrees also with what is called duty. He sees then
that a system of nature could indeed subsist with such a universal
law although men (like the South Sea islanders) should let their
talents rust, and resolve to devote their lives merely to idleness,
amusement, and propagation of their species--in a word, to
enjoyment; but he cannot possibly WILL that this should be a
universal law of nature, or be implanted in us as such by a natural
instinct. For, as a rational being, he necessarily wills that his
faculties be developed, since they serve him, and have been given
him, for all sorts of possible purposes.
4. A fourth, who is in prosperity, while he sees that others have to
contend with great wretchedness and that he could help them, thinks:
What concern is it of mine? Let everyone be as happy as heaven
pleases, or as he can make himself; I will take nothing from him nor
even envy him, only I do not wish to contribute anything to his
welfare or to his assistance in distress! Now no doubt if such a
mode of thinking were a universal law, the human race might very
well subsist, and doubtless even better than in a state in which
everyone talks of sympathy and good-will, or even takes care
occasionally to put it into practice, but on the other side, also
cheats when he can, betrays the rights of men, or otherwise violates
them. But although it is possible that a universal law of nature
might exist in accordance with that maxim, it is impossible to WILL
that such a principle should have the universal validity of a law of
nature. For a will which resolved this would contradict itself,
inasmuch as many cases might occur in which one would have need of
the love and sympathy of others, and in which, by such a law of
nature, sprung from his own will, he would deprive himself of all
hope of the aid he desires.
These are a few of the many actual duties, or at least what we
regard as such, which obviously fall into two classes on the one
principle that we have laid down. We must be ABLE TO WILL that a
maxim of our action should be a universal law. This is the canon of
the moral appreciation of the action generally. Some actions are of
such a character that their maxim cannot without contradiction be
even CONCEIVED as a universal law of nature, far from it being
possible that we should WILL that it SHOULD be so. In others this
intrinsic impossibility is not found, but still it is impossible to
WILL THAT their maxim should be raised to the universality of a law
of nature, since such a will would contradict itself. It is easily
seen that the former violate strict or rigorous (inflexible) duty;
the latter only laxer (meritorious) duty. Thus it has been
completely shown by these examples how all duties depend as regards
the nature of the obligation (not the object of the action) on the
same principle.
If now we attend to ourselves on occasion of any transgression of
duty, we shall find that we in fact do not will that our maxim
should be a universal law, for that is impossible for us; on the
contrary we will that the opposite should remain a universal law,
only we assume the liberty of making an EXCEPTION in our own favour
or (just for this time only) in favour of our inclination.
Consequently if we considered all cases from one and the same point
of view, namely, that of reason, we should find a contradiction in
our own will, namely, that a certain principle should be objectively
necessary as a universal law, and yet subjectively should not be
universal, but admit of exceptions. As however we at one moment
regard our action from the point of view of a will wholly conformed
to reason, and then again look at the same action from the point of
view of a will affected by inclination, there is not really any
contradiction, but an antagonism of inclination to the precept of
reason, whereby the universality of the principle is changed into a
mere generality, so that the practical principle of reason shall
meet the maxim half way. Now, although this cannot be justified in
our own impartial judgment, yet it proves that we do really
recognise the validity of the categorical imperative and (with all
respect for it) only allow ourselves a few exceptions, which we
think unimportant and forced from us.
We have thus established at least this much, that if duty is a
conception which is to have any import and real legislative
authority for our actions, it can only be expressed in categorical,
and not at all in hypothetical imperatives. We have also, which is
of great importance, exhibited clearly and definitely for every
practical application the content of the categorical imperative,
which must contain the principle of all duty if there is such a
thing at all. We have not yet, however, advanced so far as to prove
a priori that there actually is such an imperative, that there is a
practical law which commands absolutely of itself, and without any
other impulse, and that the following of this law is duty.
With the view of attaining to this it is of extreme importance to
remember that we must not allow ourselves to think of deducing the
reality of this principle from the particular attributes of human
nature. For duty is to be a practical, unconditional necessity of
action; it must therefore hold for all rational beings (to whom an
imperative can apply at all) and for this reason only be also a law
for all human wills. On the contrary, whatever is deduced from the
particular natural characteristics of humanity, from certain
feelings and propensions, [Footnote: Kant distinguishes "Hang
(propensio)" from "Neigung (inclinatio)" as follows:--"Hang" is a
predisposition to the desire of some enjoyment; in other words, it
is the subjective possibility of excitement of a certain desire,
which precedes the conception of its object. When the enjoyment has
been experienced, it produces a "Neigung" (inclination) to it, which
accordingly is defined "habitual sensible desire."--Anthropologie,
72, 79; Religion, p. 31.] nay even, if possible, from any particular
tendency proper to human reason, and which need not necessarily hold
for the will of every rational being; this may indeed supply us with
a maxim, but not with a law; with a subjective principle on which we
may have a propension and inclination to act, but not with an
objective principle on which we should be enjoined to act, even
though all our propensions, inclinations, and natural dispositions
were opposed to it. In fact the sublimity and intrinsic dignity of
the command in duty are so much the more evident, the less the
subjective impulses favour it and the more they oppose it, without
being able in the slightest degree to weaken the obligation of the
law or to distinguish its validity.
Here then we see philosophy brought to a critical position, since it
has to be firmly fixed, notwithstanding that it has nothing to
support it either in heaven or earth. Here it must show its purity
as absolute dictator of its own laws, not the herald of those which
are whispered to it by an implanted sense or who knows what tutelary
nature. Although these may be better than nothing, yet they can
never afford principles dictated by reason, which must have their
source wholly a priori and thence their commanding authority,
expecting everything from the supremacy of the law and the due
respect for it, nothing from inclination, or else condemning the man
to self-contempt and inward abhorrence.
Thus every empirical element is not only quite incapable of being an
aid to the principle of morality, but is even highly prejudicial to
the purity of morals, for the proper and inestimable worth of an
absolutely good will consists just in this, that the principle of
action is free, from all influence of contingent grounds, which
alone experience can furnish. We cannot too much or too often repeat
our warning against this lax and even mean habit of thought which
seeks for its principle amongst empirical motives and laws; for
human reason in its weariness is glad to rest on this pillow, and in
a dream of sweet illusions (in which, instead of Juno, it embraces a
cloud) it substitutes for morality a bastard patched up from limbs
of various derivation, which looks like anything one chooses to see
in it; only not like virtue to one who has once beheld her in her
true form. [Footnote: To behold virtue in her proper form is nothing
else but to contemplate morality stripped of all admixture of
sensible things and of every spurious ornament of reward or self-
love. How much she then eclipses everything else that appears
charming to the affections, every one may readily perceive with the
least exertion of his reason, if it be not wholly spoiled for
abstraction.]
The question then is this: Is it a necessary law for all rational
beings that they should always judge of their actions by maxims of
which they can themselves will that they should serve as universal
laws? If it is so, then it must be connected (altogether a priori)
with the very conception of the will of a rational being generally.
But in order to discover this connexion we must, however
reluctantly, take a step into metaphysic, although into a domain of
it which is distinct from speculative philosophy, namely, the
metaphysic of morals. In a practical philosophy, where it is not the
reasons of what happens that we have to ascertain, but the laws of
what ought to happen, even although it never does, i. e., objective
practical laws, there it is not necessary to inquire into the
reasons why anything pleases or displeases, how the pleasure of mere
sensation differs from taste, and whether the latter is distinct
from a general satisfaction of reason; on what the feeling of
pleasure or pain rests, and how from it desires and inclinations
arise, and from these again maxims by the co-operation of reason:
for all this belongs to an empirical psychology, which would
constitute the second part of physics, if we regard physics as the
philosophy of nature, so far as it is based on empirical laws. But
here we are concerned with objective practical laws, and
consequently with the relation of the will to itself so far as it is
determined by reason alone, in which case whatever has reference to
anything empirical is necessarily excluded; since if reason of
itself alone determines the conduct (and it is the possibility of
this that we are now investigating), it must necessarily do so a
priori.
The will is conceived as a faculty of determining oneself to action
in accordance with the conception of certain laws. And such a
faculty can be found only in rational beings. Now that which serves
the will as the objective ground of its self-determination is the
end, and if this is assigned by reason alone, it must hold for all
rational beings. On the other hand, that which merely contains the
ground of possibility of the action of which the effect is the end,
this is called the means. The subjective ground of the desire is the
spring, the objective ground of the volition is the motive; hence
the distinction between subjective ends which rest on springs and
objective ends which depend on motives valid for every rational
being. Practical principles are formal when they abstract from all
subjective ends, they are material when they assume these, and
therefore particular springs of action. The ends which a rational
being proposes to himself at pleasure as effects of his actions
(material ends) are all only relative, for it is only their relation
to the particular desires of the subject that gives them their
worth, which therefore cannot furnish principles universal and
necessary for all rational beings and for every volition, that is to
say practical laws. Hence all these relative ends can give rise only
to hypothetical imperatives.
Supposing, however, that there were something whose existence has in
itself an absolute worth, something which, being an end in itself,
could be a source of definite laws, then in this and this alone
would He the source of a possible categorical imperative, i. e., a
practical law.
Now I say: man and generally any rational being exists as an end in
himself, not merely as a means to be arbitrarily used by this or
that will, but in all his actions, whether they concern himself or
other rational beings, must be always regarded at the same time as
an end. All objects of the inclinations have only a conditional
worth, for if the inclinations and the wants founded on them did not
exist, then their object would be without value. But the
inclinations themselves being sources of want, are so far from
having an absolute worth for which they should be desired, that on
the contrary it must be the universal wish of every rational being
to be wholly free from them. Thus the worth of any object which is
to be acquired by our action is always conditional. Beings whose
existence depends not on our will but on nature's, have
nevertheless, if they are irrational beings, only a relative value
as means, and are therefore called things; rational beings, on the
contrary, are called persons, because their very nature points them
out as ends in themselves, that is as something which must not be
used merely as means, and so far therefore restricts freedom of
action (and is an object of respect). These, therefore, are not
merely subjective ends whose existence has a worth for us as an
effect of our action but objective ends, that is things whose
existence is an end in itself: an end moreover for which no other
can be substituted, which they should subserve merely as means, for
otherwise nothing whatever would possess absolute worth; but if all
worth were conditioned and therefore contingent, then there would be
no supreme practical principle of reason whatever.
If then there is a supreme practical principle or, in respect of the
human will, a categorical imperative, it must be one which, being
drawn from the conception of that which is necessarily an end for
every one because it is an end in itself, constitutes an objective
principle of will, and can therefore serve as a universal practical
law. The foundation of this principle is: rational nature exists as
an end in itself. Man necessarily conceives his own existence as
being so; so far then this is a subjective principle of human
actions. But every other rational being regards its existence
similarly, just on the same rational principle that holds for me:
[Footnote: This proposition is here stated as a postulate. The
grounds of it will be found in the concluding section.] so that it
is at the same time an objective principle, from which as a supreme
practical law all laws of the will must be capable of being deduced.
Accordingly the practical imperative will be as follows: So act as
to treat humanity, whether in thine own person or in that of any
other, in every case as an end withal, never as means only. We will
now inquire whether this can be practically carried out.
To abide by the previous examples:
Firstly, under the head of necessary duty to oneself: He who
contemplates suicide should ask himself whether his action can be
consistent with the idea of humanity as an end in itself. If he
destroys himself in order to escape from painful circumstances, he
uses a person merely as a mean to maintain a tolerable condition up
to the end of life. But a man is not a thing, that is to say,
something which can be used merely as means, but must in all his
actions be always considered as an end in himself. I cannot,
therefore, dispose in any way of a man in my own person so as to
mutilate him, to damage or kill him. (It belongs to ethics proper to
define this principle more precisely so as to avoid all
misunderstanding, e. g., as to the amputation of the limbs in order
to preserve myself; as to exposing my life to danger with a view to
preserve it, &c. This question is therefore omitted here.)
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