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place appointed in the corresponding faculty of cognition； and
consequently the influence of the one faculty upon the other is made
apparent。
*Sensibility； subjected to the understanding； as the object upon
which the understanding employs its functions； is the source of real
cognitions。 But； in so far as it exercises an influence upon the
action of the understanding and determines it to judgement；
sensibility is itself the cause of error。
It is not at present our business to treat of empirical illusory
appearance （for example； optical illusion）； which occurs in the
empirical application of otherwise correct rules of the understanding；
and in which the judgement is misled by the influence of
imagination。 Our purpose is to speak of transcendental illusory
appearance； which influences principles… that are not even applied
to experience； for in this case we should possess a sure test of their
correctness… but which leads us； in disregard of all the warnings of
criticism； pletely beyond the empirical employment of the
categories and deludes us with the chimera of an extension of the
sphere of the pure understanding。 We shall term those principles the
application of which is confined entirely within the limits of
possible experience； immanent； those； on the other hand； which
transgress these limits； we shall call transcendent principles。 But by
these latter I do not understand principles of the transcendental
use or misuse of the categories； which is in reality a mere fault of
the judgement when not under due restraint from criticism； and
therefore not paying sufficient attention to the limits of the
sphere in which the pure understanding is allowed to exercise its
functions； but real principles which exhort us to break down all those
barriers； and to lay claim to a perfectly new field of cognition；
which recognizes no line of demarcation。 Thus transcendental and
transcendent are not identical terms。 The principles of the pure
understanding； which we have already propounded； ought to be of
empirical and not of transcendental use； that is； they are not
applicable to any object beyond the sphere of experience。 A
principle which removes these limits； nay； which authorizes us to
overstep them； is called transcendent。 If our criticism can succeed in
exposing the illusion in these pretended principles； those which are
limited in their employment to the sphere of experience may be called；
in opposition to the others； immanent principles of the pure
understanding。
Logical illusion； which consists merely in the imitation of the form
of reason （the illusion in sophistical syllogisms）； arises entirely
from a want of due attention to logical rules。 So soon as the
attention is awakened to the case before us； this illusion totally
disappears。 Transcendental illusion； on the contrary； does not cease
to exist； even after it has been exposed； and its nothingness
clearly perceived by means of transcendental criticism。 Take； for
example； the illusion in the proposition： 〃The world must have a
beginning in time。〃 The cause of this is as follows。 In our reason；
subjectively considered as a faculty of human cognition； there exist
fundamental rules and maxims of its exercise； which have pletely
the appearance of objective principles。 Now from this cause it happens
that the subjective necessity of a certain connection of our
conceptions； is regarded as an objective necessity of the
determination of things in themselves。 This illusion it is
impossible to avoid； just as we cannot avoid perceiving that the sea
appears to be higher at a distance than it is near the shore；
because we see the former by means of higher rays than the latter； or；
which is a still stronger case； as even the astronomer cannot
prevent himself from seeing the moon larger at its rising than some
time afterwards； although he is not deceived by this illusion。
Transcendental dialectic will therefore content itself with exposing
the illusory appearance in transcendental judgements； and guarding
us against it； but to make it； as in the case of logical illusion；
entirely disappear and cease to be illusion is utterly beyond its
power。 For we have here to do with a natural and unavoidable illusion；
which rests upon subjective principles and imposes these upon us as
objective； while logical dialectic； in the detection of sophisms；
has to do merely with an error in the logical consequence of the
propositions； or with an artificially constructed illusion； in
imitation of the natural error。 There is； therefore； a natural and
unavoidable dialectic of pure reason… not that in which the bungler；
from want of the requisite knowledge； involves himself； nor that which
the sophist devises for the purpose of misleading； but that which is
an inseparable adjunct of human reason； and which； even after its
illusions have been exposed； does not cease to deceive； and
continually to lead reason into momentary errors； which it bees
necessary continually to remove。
II。 Of Pure Reason as the Seat of Transcendental Illusory
Appearance。
A。 OF REASON IN GENERAL。
All our knowledge begins with sense； proceeds thence to
understanding； and ends with reason； beyond which nothing higher can
be discovered in the human mind for elaborating the matter of
intuition and subjecting it to the highest unity of thought。 At this
stage of our inquiry it is my duty to give an explanation of this； the
highest faculty of cognition； and I confess I find myself here in some
difficulty。 Of reason； as of the understanding； there is a merely
formal； that is； logical use； in which it makes abstraction of all
content of cognition； but there is also a real use； inasmuch as it
contains in itself the source of certain conceptions and principles；
which it does not borrow either from the senses or the
understanding。 The former faculty has been long defined by logicians
as the faculty of mediate conclusion in contradistinction to immediate
conclusions （consequentiae immediatae）； but the nature of the
latter； which itself generates conceptions； is not to be understood
from this definition。 Now as a division of reason into a logical and a
transcendental faculty presents itself here； it bees necessary to
seek for a higher conception of this source of cognition which shall
prehend both conceptions。 In this we may expect； according to the
analogy of the conceptions of the understanding； that the logical
conception will give us the key to the transcendental； and that the
table of the functions of the former will present us with the clue
to the conceptions of reason。
In the former part of our transcendental logic； we defined the
understanding to be the faculty of rules； reason may be
distinguished from understanding as the faculty of principles。
The term principle is ambiguous； and monly signifies merely a
cognition that may be employed as a principle； although it is not in
itself； and as regards its proper origin； entitled to the distinction。
Every general proposition； even if derived from experience by the
process of induction； may serve as the major in a syllogism； but it is
not f