The Notebooks of Leonardo Da Vinci (Primary source)
The Notebooks of Leonardo da Vinci, translated by Jean Paul Richter, is a thematic anthology of Leonardo’s writings on art, science, anatomy, engineering, and philosophy—revealing the genius’s insights, observations, and inventions through his own reflective and analytical prose.
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“A man is worthy of praise or blame solely on account of those actions which lie within his power to do or not to do.”
— Leonardo da Vinci Primary source“Any one who in discussion relies upon authority uses, not his understanding, but rather his memory.”
— Leonardo da Vinci Primary source“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.”
— Leonardo da Vinci Primary source“Threats alone are the weapons of the threatened man.”
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“Truth was the only daughter of Time.”
— Leonardo da Vinci Primary source“He that can have patience can have what he will.”
— Benjamin Franklin Primary source“The road of excess leads to the palace of wisdom.”
— William Blake Primary source“Virtue and happiness are mother and daughter.”
— Benjamin Franklin Primary source