“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“He who thinks little, errs much.”
— Leonardo da Vinci Primary sourceMore quotes by Leonardo da Vinci →
“Best use of money is to pay debts.”
— Ralph Waldo Emerson Primary source“Books are the best of things, well used; abused, among the worst. What is the right use? What is the one end which all means go to effect? They are for nothing but to inspire.”
— Ralph Waldo Emerson Primary source“A bend in the road is not the end of the road… Unless you fail to make the turn.”
— Helen Keller Disputed“Take counsel in wine, but resolve afterwards in water.”
— Benjamin Franklin Primary sourceAction Learning Thinking Intellect