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we call a man who appears to have the power of self…government； even
although his knowledge may be very limited； by the name of
philosopher。
The legislation of human reason； or philosophy； has two objects…
nature and freedom… and thus contains not only the laws of nature； but
also those of ethics； at first in two separate systems； which；
finally； merge into one grand philosophical system of cognition。 The
philosophy of nature relates to that which is； that of ethics to
that which ought to be。
But all philosophy is either cognition on the basis of pure
reason； or the cognition of reason on the basis of empirical
principles。 The former is termed pure； the latter empirical
philosophy。
The philosophy of pure reason is either propaedeutic； that is； an
inquiry into the powers of reason in regard to pure a priori
cognition； and is termed critical philosophy； or it is； secondly；
the system of pure reason… a science containing the systematic
presentation of the whole body of philosophical knowledge； true as
well as illusory； given by pure reason… and is called metaphysic。 This
name may； however； be also given to the whole system of pure
philosophy； critical philosophy included； and may designate the
investigation into the sources or possibility of a priori cognition；
as well as the presentation of the a priori cognitions which form a
system of pure philosophy… excluding； at the same time； all
empirical and mathematical elements。
Metaphysic is divided into that of the speculative and that of the
practical use of pure reason； and is； accordingly； either the
metaphysic of nature； or the metaphysic of ethics。 The former contains
all the pure rational principles… based upon conceptions alone （and
thus excluding mathematics）… of all theoretical cognition； the latter；
the principles which determine and necessitate a priori all action。
Now moral philosophy alone contains a code of laws… for the regulation
of our actions… which are deduced from principles entirely a priori。
Hence the metaphysic of ethics is the only pure moral philosophy； as
it is not based upon anthropological or other empirical
considerations。 The metaphysic of speculative reason is what is
commonly called metaphysic in the more limited sense。 But as pure
moral philosophy properly forms a part of this system of cognition； we
must allow it to retain the name of metaphysic； although it is not
requisite that we should insist on so terming it in our present
discussion。
It is of the highest importance to separate those cognitions which
differ from others both in kind and in origin； and to take great
care that they are not confounded with those with which they are
generally found connected。 What the chemist does in the analysis of
substances； what the mathematician in pure mathematics； is； in a still
higher degree； the duty of the philosopher； that the value of each
different kind of cognition； and the part it takes in the operations
of the mind； may be clearly defined。 Human reason has never wanted a
metaphysic of some kind； since it attained the power of thought； or
rather of reflection； but it has never been able to keep this sphere
of thought and cognition pure from all admixture of foreign
elements。 The idea of a science of this kind is as old as
speculation itself； and what mind does not speculate… either in the
scholastic or in the popular fashion？ At the same time； it must be
admitted that even thinkers by profession have been unable clearly
to explain the distinction between the two elements of our
cognition… the one completely a priori； the other a posteriori； and
hence the proper definition of a peculiar kind of cognition； and
with it the just idea of a science which has so long and so deeply
engaged the attention of the human mind； has never been established。
When it was said： 〃Metaphysic is the science of the first principles
of human cognition；〃 this definition did not signalize a peculiarity
in kind； but only a difference in degree； these first principles
were thus declared to be more general than others； but no criterion of
distinction from empirical principles was given。 Of these some are
more general； and therefore higher； than others； and… as we cannot
distinguish what is completely a priori from that which is known to be
a posteriori… where shall we draw the line which is to separate the
higher and so…called first principles； from the lower and
subordinate principles of cognition？ What would be said if we were
asked to be satisfied with a division of the epochs of the world
into the earlier centuries and those following them？ 〃Does the
fifth； or the tenth century belong to the earlier centuries？〃 it would
be asked。 In the same way I ask： Does the conception of extension
belong to metaphysics？ You answer； 〃Yes。〃 Well； that of body too？
〃Yes。〃 And that of a fluid body？ You stop； you are unprepared to admit
this； for if you do； everything will belong to metaphysics。 From
this it is evident that the mere degree of subordination… of the
particular to the general… cannot determine the limits of a science；
and that； in the present case； we must expect to find a difference
in the conceptions of metaphysics both in kind and in origin。 The
fundamental idea of metaphysics was obscured on another side by the
fact that this kind of a priori cognition showed a certain
similarity in character with the science of mathematics。 Both have the
property in common of possessing an a priori origin； but； in the
one； our knowledge is based upon conceptions； in the other； on the
construction of conceptions。 Thus a decided dissimilarity between
philosophical and mathematical cognition comes out… a dissimilarity
which was always felt； but which could not be made distinct for want
of an insight into the criteria of the difference。 And thus it
happened that； as philosophers themselves failed in the proper
development of the idea of their science； the elaboration of the
science could not proceed with a definite aim； or under trustworthy
guidance。 Thus； too； philosophers； ignorant of the path they ought
to pursue and always disputing with each other regarding the
discoveries which each asserted he had made； brought their science
into disrepute with the rest of the world； and finally； even among
themselves。
All pure a priori cognition forms； therefore； in view of the
peculiar faculty which originates it； a peculiar and distinct unity；
and metaphysic is the term applied to the philosophy which attempts to
represent that cognition in this systematic unity。 The speculative
part of metaphysic； which has especially appropriated this
appellation… that which we have called the metaphysic of nature… and
which considers everything； as it is （not as it ought to be）； by means
of a priori conceptions； is divided in the following manner。
Metaphysic； in the more limited acceptation of the term； consists of
two parts… transcendental philosophy and the physiology of pure
reason