“Tell me if anything was ever done.”
This was written in his notebooks in despair of so many projects that were never completed.
The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

Why Me
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“You know, I think this is the first time we've ever done anything normal together.”
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“When I think of all the harm [the Bible] has done, I despair of ever writing anything to equal it.”

October 2, 1897: To-Day, An Interview with Sir Walter Besant http://books.google.com/books?id=unhNAAAAYAAJ&pg=PA262

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Qu'as-tu fait, ô toi que voilà
Pleurant sans cesse,
Dis, qu'as-tu fait, toi que voilà
De ta jeunesse?
"Le ciel est, par-dessus le toit", line 13, from Sagesse (1880); Sorrell p. 111