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measure time more exactly than we with all our skin。
I had after this described the reasonable soul； and shown that it could
by no means be educed from the power of matter； as the other things of
which I had spoken； but that it must be expressly created； and that it is not
sufficient that it be lodged in the human body exactly like a pilot in a ship；
unless perhaps to move its members； but that it is necessary for it to be
joined and united more closely to the body； in order to have sensations and
appetites similar to ours； and thus constitute a real man。 I here entered； in
conclusion； upon the subject of the soul at considerable length； because it
is of the greatest moment： for after the error of those who deny the
existence of God； an error which I think I have already sufficiently refuted；
there is none that is more powerful in leading feeble minds astray from the
straight path of virtue than the supposition that the soul of the brutes is of
the same nature with our own； and consequently that after this life we
have nothing to hope for or fear； more than flies and ants； in place of
which； when we know how far they differ we much better prehend the
reasons which establish that the soul is of a nature wholly independent of
the body； and that consequently it is not liable to die with the latter and；
finally； because no other causes are observed capable of destroying it； we
are naturally led thence to judge that it is immortal。
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DISCOURSE ON THE METHOD OF RIGHTLY CONDUCTING THE REASON； AND
SEEKING TRUTH IN THE SCIENCES
PART VI
Three years have now elapsed since I finished the treatise containing
all these matters； and I was beginning to revise it； with the view to put it
into the hands of a printer； when I learned that persons to whom I greatly
defer； and whose authority over my actions is hardly less influential than is
my own reason over my thoughts； had condemned a certain doctrine in
physics； published a short time previously by another individual to which I
will not say that I adhered； but only that； previously to their censure I had
observed in it nothing which I could imagine to be prejudicial either to
religion or to the state； and nothing therefore which would have prevented
me from giving expression to it in writing； if reason had persuaded me of
its truth； and this led me to fear lest among my own doctrines likewise
some one might be found in which I had departed from the truth；
notwithstanding the great care I have always taken not to accord belief to
new opinions of which I had not the most certain demonstrations； and not
to give expression to aught that might tend to the hurt of any one。 This
has been sufficient to make me alter my purpose of publishing them； for
although the reasons by which I had been induced to take this resolution
were very strong； yet my inclination； which has always been hostile to
writing books； enabled me immediately to discover other considerations
sufficient to excuse me for not undertaking the task。 And these reasons； on
one side and the other； are such； that not only is it in some measure my
interest here to state them； but that of the public； perhaps； to know them。
I have never made much account of what has proceeded from my own
mind； and so long as I gathered no other advantage from the method I
employ beyond satisfying myself on some difficulties belonging to the
speculative sciences； or endeavoring to regulate my actions according to
the principles it taught me； I never thought myself bound to publish
anything respecting it。 For in what regards manners； every one is so full
of his own wisdom； that there might be found as many reformers as heads；
if any were allowed to take upon themselves the task of mending them；
except those whom God has constituted the supreme rulers of his people
or to whom he has given sufficient grace and zeal to be prophets； and
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DISCOURSE ON THE METHOD OF RIGHTLY CONDUCTING THE REASON； AND
SEEKING TRUTH IN THE SCIENCES
although my speculations greatly pleased myself； I believed that others
had theirs； which perhaps pleased them still more。 But as soon as I had
acquired some general notions respecting physics； and beginning to make
trial of them in various particular difficulties； had observed how far they
can carry us； and how much they differ from the principles that have been
employed up to the present time； I believed that I could not keep them
concealed without sinning grievously against the law by which we are
bound to promote； as far as in us lies； the general good of mankind。 For
by them I perceived it to be possible to arrive at knowledge highly useful
in life； and in room of the speculative philosophy usually taught in the
schools； to discover a practical； by means of which； knowing the force and
action of fire； water； air the stars； the heavens； and all the other bodies that
surround us； as distinctly as we know the various crafts of our artisans； we
might also apply them in the same way to all the uses to which they are
adapted； and thus render ourselves the lords and possessors of nature。
And this is a result to be desired； not only in order to the invention of an
infinity of arts； by which we might be enabled to enjoy without any
trouble the fruits of the earth； and all its forts； but also and especially
for the preservation of health； which is without doubt； of all the blessings
of this life； the first and fundamental one； for the mind is so intimately
dependent upon the condition and relation of the organs of the body； that if
any means can ever be found to render men wiser and more ingenious than
hitherto； I believe that it is in medicine they must be sought for。 It is true
that the science of medicine； as it now exists； contains few things whose
utility is very remarkable： but without any wish to depreciate it； I am
confident that there is no one； even among those whose profession it is；
who does not admit that all at present known in it is almost nothing in
parison of what remains to be discovered； and that we could free
ourselves from an infinity of maladies of body as well as of mind； and
perhaps also even from the debility of age； if we had sufficiently ample
knowledge of their causes； and of all the remedies provided for us by
nature。 But since I designed to employ my whole life in the search after
so necessary a science； and since I had fallen in with a path which seems
to me such； that if any one follow it he must inevitably reach the end
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DISCOURSE ON THE METHOD OF RIGHTLY CONDUCTING THE REASON； AND
SEEKING TRUTH IN THE SCIENCES
desired； unless he be hindered either by the shortness of life or the want of
experiments； I judged that there could be no more effectual provision
against these two impediments than if I