its own peculiar energy, that it draws its ideas from its own recesses;
prove, on the contrary, that in sleep it is intirely passive, that it
does not even renew its modifications, but according to the involuntary
confusion, which physical causes produce in the body, of which every
thing tends to shew the identity, the consubstantiality with the soul.
What appears to have led those into a mistake, who maintained that the
soul drew its ideas from itself, is this, they have contemplated these
ideas, as if they were real beings, when, in point of fact, they are
nothing more than the modifications produced in the brain of man, by
objects to which this brain is a stranger; they are these objects, who
are the true models, who are the real archetypes to which it is
necessary to recur: here is the source of all their errors.

In the individual who dreams, the soul does not act more from itself,
than it does in the man who is drunk, that is to say, who is modified by
some spirituous liquor: or than it does in the sick man, when he is
delirious, that is to say, when he is modified by those physical causes
which disturb his machine, which obstruct it in the performance of its
functions; or than it, does in him, whose brain is disordered: dreams,
like these various states, announce nothing more than a physical
confusion in the human machine, under the influence of which the brain
ceases to act, after a precise and regular manner: this disorder may be
traced to physical causes, such as the aliments--the humours--the
combinations--the fermentations, which are but little analogous to the
salutary state of man; from hence it will appear, that his brain is
necessarily confused, whenever his body is agitated in an extraordinary
manner.

Do not let him, therefore, believe that his soul acts by itself, or
without a cause, in any one moment of his existence; it is, conjointly