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" You do ill if you praise, but worse if you censure, what you do not understand. "

Leonardo da Vinci

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" Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind. "

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" I have offended God and mankind because my work didn't reach the quality it should have. "

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" As every divided kingdom falls, so every mind divided between many studies confounds and saps itself. "

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" Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous. "

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" The mind of the painter must resemble a mirror, which always takes the colour of the object it reflects and is completely occupied by the images of as many objects as are in front of it. "

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