“O Man, who will discern in this work of mine the wonderful works of Nature, if you think it would be a criminal thing to destroy it, reflect how much more criminal it is to take the life of a man; and if this, his external form, appears to thee marvellously constructed, remember that it is nothing as compared with the soul that dwells in that structure; for that indeed, be it what it may, is a thing divine. Leave it then to dwell in His work at His good will and pleasure, and let not your rage or malice destroy a life — for indeed, he who does not value it, does not himself deserve it.”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

Que les supplices des criminels soient utiles. Un homme pendu n’est bon à rien, et un homme condamné aux ouvrages publics sert encore la patrie, et est une leçon vivante.
"Civil and Ecclesiastical Laws," Dictionnaire philosophique (1785-1789)
The Dictionnaire philosophique was a posthumously published collection of articles combining the Dictionnaire philosophique portatif (published under various editions and titles from 1764 to 1777), the Questions sur l'Encyclopédie (published from 1770 to 1774), articles written for the Encyclopédie and the Dictionnaire de l'Académie française, the manuscript known as l'Opinion sur l'alphabet and a number of previously published miscellaneous articles.
Citas
“The Profession of Poetry”, p. 162
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)

Source: Poverty (1912), p. 7
Context: To be above the poverty line, means no more than to have a sanitary dwelling and sufficient food and clothing to keep the body in working order. It is precisely the same standard that a man would demand for his horses or slaves. Treating man merely as the "repository of a certain sort of labor power," it makes possible the utilization of that power to the fullest extent. No one will fail to realize how low such a standard is. It does not necessarily include any of the intellectual, aesthetic, moral, or social necessities; it is a purely physical standard...

Source: The Martyrdom of Man (1872), Chapter IV, "Intellect", p. 417.

Source: Aphorisms and Reflections (1901), p. 226