Though human ingenuity may make various inventions which, by the help of various machines answering the same end, it will never devise any inventions more beautiful, nor more simple, nor more to the purpose than Nature does; because in her inventions nothing is wanting, and nothing is superfluous.[Ancorachè lo ingiegnio vmano faccia iuētioni varie, rispōdedo co uari strumēti a u medesimo fine, mai esso troverà inuentione più bella, nè più facile, nè più brieue della natura, perchè nelle sue invenzioni nullo manca e nullo è superfluo.]

Source:The Literary Works of Leonardo da Vinci (Richter, ed. 1883), Volume II, Section 837, Page 126
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