The Notebooks of Leonardo Da Vinci

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Page 1177 of 1565.
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On Mount Etna the words freeze in your mouth and you may make ice of
them.[Footnote 2: There is no clue to explain this strange
sentence.]

Just as iron rusts unless it is used, and water putrifies or, in
cold, turns to ice, so our intellect spoils unless it is kept in
use.

You do ill if you praise, and still worse if you reprove in a matter
you do not understand.

When Fortune comes, seize her in front with a sure hand, because
behind she is bald.

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