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Consider, O reader, how far we can lend credence to the ancients who strove to define the soul and life,—things which cannot be proved; while those things which can be clearly known and proved by experience remained during so many centuries ignored and misrepresented! The eye, which so clearly demonstrates its functions, has been up to my time defined in one manner by countless authorities; I by experience have discovered another definition.

Consider, O reader, how far we can lend credence to the ancients who strove to define the soul and life,—things which cannot be proved; while those things which can be clearly known and proved by experience remained during so many centuries ignored and misrepresented! The eye, which so clearly demonstrates its functions, has been up to my time defined in one manner by countless authorities; I by experience have discovered another definition.

Approximate author period: c. 1486 AD · medieval

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Attribution & collection notes
Author or tradition
Leonardo da Vinci
Attribution: attributed
Country attributed
Not established
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Historical period
Approximate author period: c. 1486 AD · medieval
author lifetime midpoint (1452–1519); not quotation composition date
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Recorded source
Thoughts on Art and Life (1906 English edition) (1906 AD)

Thoughts on Life, complete printed unit 46; Maurice Baring translation; Boston: The Merrymount Press,1906

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Leonardo da Vinci: Drawn portrait

Represented by the complete source-numbered selections in Thoughts on Art and Life, Maurice Baring’s1906English translation, edited by Lewis Einstein. The catalogue records1452–1519; the historical collection is a selection from notebooks, not a continuous book composed by Leonardo or independent authentication of every attributed passage.

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