“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
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“Reprove your friend in secret and praise him openly.”
— Leonardo da Vinci Primary source“Necessity is the mistress and guide of nature.”
— Leonardo da Vinci Primary sourceMore quotes by Leonardo da Vinci →
“Take counsel in wine, but resolve afterwards in water.”
— Benjamin Franklin Primary source“A bend in the road is not the end of the road… Unless you fail to make the turn.”
— Helen Keller Disputed“Study without desire spoils the memory, and it retains nothing that it takes in.”
— Leonardo da Vinci Primary source“You never know what is enough unless you know what is more than enough.”
— William Blake Primary sourceAction Learning Thinking Intellect