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“Wisdom is the daughter of experience.”
— 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.”
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“Let him think I am more man than I am and I will be so.”
— Ernest Hemingway Primary source“Alone we can do so little; together we can do so much.”
— Helen Keller Disputed“But man is not made for defeat. A man can be destroyed but not defeated.”
— Ernest Hemingway Primary source“Every man alone is sincere. At the entrance of a second person, hypocrisy begins.”
— Ralph Waldo Emerson Primary source