“Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.”

—  Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

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Leonardo Da Vinci363
Italian Renaissance polymath 1452–1519

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