That this is the true and only possible deduction of the idea of
acquisition by contract is sufficiently attested by the laborious
yet always futile striving of writers on jurisprudence such as Moses
Mendelssohn in his Jerusalem- to adduce a proof of its rational
possibility. The question is put thus: "Why ought I to keep my
Promise?" For it is assumed as understood by all that I ought to do
so. It is, however, absolutely impossible to give any further proof of
the categorical imperative implied; just as it is impossible for the
geometrician to prove by rational syllogisms that in order to
construct a triangle I must take three lines- so far an analytical
proposition- of which three lines any two together must be greater
than the third- a synthetical proposition, and like the former a
priori. It is a postulate of the pure reason that we ought to abstract
from all the sensible conditions of space and time in reference to the
conception of right; and the theory of the possibility of such
abstraction from these conditions, without taking away the reality
of the possession, just constitutes the transcendental deduction of
the conception of acquisition by contract. It is quite akin to what
was presented under the last title, as the theory of acquisition by
occupation of the external object.
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