Let us not, then, be surprised, if, when man would account to himself
for his existence, for his manner of acting, finding so many obstacles
to encounter, he invented such strange hypotheses to explain the
concealed spring of his machine--if then this motion appeared to him, to
be different from that of other bodies, he conceived an idea, that he
moved and acted in a manner altogether distinct from the other beings in
Nature. He clearly perceived that his body, as well as different parts
of it, did act; but, frequently, he was unable to discover what brought
them into action: from whence he received the impulse: he then
conjectured he contained within himself a moving principle distinguished
from his machine, which secretly gave an impulse to the springs which
set this machine in motion; that moved him by its own natural energy;
that consequently he acted according to laws totally distinct from those
which regulated the motion of other beings: he was conscious of certain
internal motion, which he could not help feeling; but how could he
conceive, that this invisible motion was so frequently competent to
produce such striking effects? How could he comprehend, that a fugitive
idea, an imperceptible act of thought, was so frequently capacitated to
bring his whole being into trouble and confusion? He fell into the
belief, that he perceived within himself a substance distinguished from
that self, endowed with a secret force; in which he supposed existed
qualities distinctly differing from those, of either the visible causes
that acted on his organs, or those organs themselves. He did not
sufficiently understand, that the primitive cause which makes a stone
fall, or his arm move, are perhaps as difficult of comprehension, as
arduous to be explained, as those internal impulses, of which his
thought or his will are the effects. Thus, for want of meditating
Nature--of considering her under her true point of view--of remarking
the conformity--of noticing the simultaneity, the unity of the motion of
this fancied motive-power with that of his body--of his material organs