“Let no man who is not a Mathematician read the elements of my work.”
The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

“The man who reads nothing at all is better educated than the man who reads nothing but newspapers.”

“To read is to let someone else work for you — the most delicate form of exploitation.”
Anathemas and Admirations (1987)

Statement recorded in the diary of his companion Johanna Fantova, quoted at the end of the New York Times story "From Companion's Lost Diary, A Portrait of Einstein in Old Age" http://www.nytimes.com/2004/04/24/nyregion/from-companion-s-lost-diary-a-portrait-of-einstein-in-old-age.html?pagewanted=all&src=pm by Dennis Overbye (24 April 2004)
Attributed in posthumous publications

A Conversation with Ward Cunningham (2003), The Simplest Thing that Could Possibly Work

As quoted in Science Teaching : The Role of History and Philosophy of Science (1994) by Michael R. Matthews, p. 195
This quote should be removed from the disputed section: A Debate with Felix the Manichean{AD 404) para 1709 from The Faith of the Early Fathers: St. Augustine to the end of the patristic age" W.A. Jurgens https://books.google.com/books?id=rkvLsueY_DwC&pg=PA88&lpg=PA88&dq=augustine+a+debate+with+felix+the+manichean&source=bl&ots=hjro48PiBF&sig=ARQdKxrvvOTvzhIZHPqDRnldwWk&hl=en&sa=X&ved=0ahUKEwj8ybaI0oLLAhUM4GMKHUosAaYQ6AEIJzAC#v=onepage&q=augustine%20a%20debate%20with%20felix%20the%20manichean&f=false
Disputed

“A man perfects himself by work much more than by reading.”
1860s, On The Choice Of Books (1866)

"How to Tell a Major Poet from a Minor Poet" in The New Yorker (1938); reprinted in Quo Vadimus: Or, the Case for the Bicycle (1939)

Letter to Mitchell Kennerley about the book Woodrow Wilson and the World's Peace, October 1, 1917 https://books.google.com/books?id=Gr6atcdK37EC&pg=PA123 https://books.google.com/books?id=2BL2AwAAQBAJ&pg=PA2383
1910s