“The greatest deception men suffer is from their own opinions.”
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“He who does not punish evil commands it to be done.”
— Leonardo da Vinci Primary source“He who wishes to be rich in a day will be hanged in a year.”
— Leonardo da Vinci Primary sourceMore quotes by Leonardo da Vinci →
“Do not do that which you would not have known.”
— Benjamin Franklin Primary source“Observe all men; thyself most.”
— Benjamin Franklin Primary source“Altogether too often, people substitute opinions for facts and emotions for analysis.”
— Andrew S. Grove Primary source“Coolness is the greatest quality in a man destined to command.”
— Napoleon Bonaparte Disputed