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Every action must be caused by motion.

Every action must be caused by motion.
Leonardo da Vinci ↗
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Source
Thoughts on Art and Life (1906 English edition)
Thoughts on Science, complete printed unit 15; Maurice Baring translation; Boston: The Merrymount Press,1906
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Attribution confidence
attributed · historical anthology
Preserved as printed; independently unverified.
Historical coordinate
c. 1486 AD · medieval
author lifetime midpoint (1452–1519); not quotation composition date; not composition date.
Rights & edition
Public domain (United States)
Translations and rights may differ elsewhere.
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The voice behind the words.

Represented by the complete source-numbered selections in Thoughts on Art and Life, Maurice Baring’s1906English translation, edited by Lewis Einstein. The catalogue records1452–1519; the historical collection is a selection from notebooks, not a continuous book composed by Leonardo or independent authentication of every attributed passage.

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01c. 1486 AD
Not louder does the tempestuous sea bellow when the north wind strikes its foaming waves between Scylla and Charybdis; nor Stromboli nor Mount Etna when the sulphurous flames, shattering and bursting open the great mountain with violence, hurl stones and earth through the air with the flame it vomits; nor when the fiery caverns of Mount Etna, spitting forth the element which it cannot restrain, hurl it back to the place whence it issued, driving furiously before it any obstacle in the way of its vehement fury ... so I, urged by my great desire and longing to see the blending of strange and various shapes made by creating nature, wandered for some time among the dark rocks, and came to the entrance of a great cave, in front of which I long stood in astonishment and ignorance of such a thing. I bent my back into an arch and rested my left hand on my knee, and with my right hand shaded my downcast eyes and contracted eyebrows. I bent down first on one side and then on the other to see whether I could perceive anything, but the thick darkness rendered this impossible; and after having remained there some time, two things arose within me, fear and desire,—fear of the dark and threatening cave, desire to see whether there were anything marvellous within.
Leonardo da Vinci / quote
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03c. 1486 AD
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