The Notebooks of Leonardo Da Vinci Complete


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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.  
1
214.  
OF SPIRITS.  
We have said, on the other side of this page, that the definition of  
a spirit is a power conjoined to a body; because it cannot move of  
its own accord, nor can it have any kind of motion in space; and if  
you were to say that it moves itself, this cannot be within the  
elements. For, if the spirit is an incorporeal quantity, this  
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