The Notebooks of Leonardo Da Vinci

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Of all human opinions that is to be reputed the most foolish which
deals with the belief in Necromancy, the sister of Alchemy, which
gives birth to simple and natural things. But it is all the more
worthy of reprehension than alchemy, because it brings forth nothing
but what is like itself, that is, lies; this does not happen in
Alchemy which deals with simple products of nature and whose
function cannot be exercised by nature itself, because it has no
organic instruments with which it can work, as men do by means of
their hands, who have produced, for instance, glass &c. but this
Necromancy the flag and flying banner, blown by the winds, is the
guide of the stupid crowd which is constantly witness to the
dazzling and endless effects of this art; and there are books full,
declaring that enchantments and spirits can work and speak without
tongues and without organic instruments-- without which it is
impossible to speak-- and can carry heaviest weights and raise
storms and rain; and that men can be turned into cats and wolves and
other beasts, although indeed it is those who affirm these things
who first became beasts.

And surely if this Necromancy did exist, as is believed by small
wits, there is nothing on the earth that would be of so much
importance alike for the detriment and service of men, if it were
true that there were in such an art a power to disturb the calm
serenity of the air, converting it into darkness and making
coruscations or winds, with terrific thunder and lightnings rushing
through the darkness, and with violent storms overthrowing high
buildings and rooting up forests; and thus to oppose armies,
crushing and annihilating them; and, besides these frightful storms
may deprive the peasants of the reward of their labours.--Now what
kind of warfare is there to hurt the enemy so much as to deprive him
of the harvest? What naval warfare could be compared with this? I
say, the man who has power to command the winds and to make ruinous
gales by which any fleet may be submerged, --surely a man who could
command such violent forces would be lord of the nations, and no
human ingenuity could resist his crushing force. The hidden
treasures and gems reposing in the body of the earth would all be
made manifest to him. No lock nor fortress, though impregnable,
would be able to save any one against the will of the necromancer.
He would have himself carried through the air from East to West and
through all the opposite sides of the universe. But why should I
enlarge further upon this? What is there that could not be done by
such a craftsman? Almost nothing, except to escape death. Hereby I
have explained in part the mischief and the usefulness, contained in
this art, if it is real; and if it is real why has it not remained
among men who desire it so much, having nothing to do with any
deity? For I know that there are numberless people who would, to
satisfy a whim, destroy God and all the universe; and if this
necromancy, being, as it were, so necessary to men, has not been
left among them, it can never have existed, nor will it ever exist
according to the definition of the spirit, which is invisible in
substance; for within the elements there are no incorporate things,
because where there is no body, there is a vacuum; and no vacuum can
exist in the elements because it would be immediately filled up.
Turn over.

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