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Division of Philosophy.

Philosophy
may be said to contain
the principles
of the rational cognition
that concepts afford us of things
not merely
as with logic
the principles
of the form of thought in general
irrespective of the objects
and thus interpreted
the course usually adopted
of dividing it into
theoretical and practical
is perfectly sound
but this makes imperative
a specific distinction
on the part of the concepts 
by which the principles
of this rational cognition
get their object assigned to them
for if the concepts are not distinct
they fail to justify a division
which always presupposes
that the principles 
belonging to the rational cognition
of the several parts of the science in question
are themselves mutually exclusive.

Immanuel Kant.