“To develop a complete mind: Study the science of art; Study the art of science. Learn how to see. Realize that everything connects to everything else.”
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

“Science is what we understand well enough to explain to a computer. Art is everything else we do.”
Foreword to the book A=B http://www.cis.upenn.edu/~wilf/AeqB.html (1996)
Source: Things a Computer Scientist Rarely Talks About
As quoted in "James Clavell, Best-Selling Storyteller of Far Eastern Epics, Is Dead at 69" by William Grimes in The New York Times (8 September 1994) http://query.nytimes.com/gst/fullpage.html?res=9D03E4D61138F93BA3575AC0A962958260&sec=&spon=&pagewanted=all
Context: Changi became my university instead of my prison. … Among the inmates there were experts in all walks of life — the high and the low roads. I studied and absorbed everything I could from physics to counterfeiting, but most of all I learned the art of surviving.

Letter to Abigail Adams (12 May 1780)
1780s
Context: The science of government it is my duty to study, more than all other sciences; the arts of legislation and administration and negotiation ought to take the place of, indeed exclude, in a manner, all other arts. I must study politics and war, that our sons may have liberty to study mathematics and philosophy. Our sons ought to study mathematics and philosophy, geography, natural history and naval architecture, navigation, commerce and agriculture in order to give their children a right to study painting, poetry, music, architecture, statuary, tapestry and porcelain.

“Realize that everything connects to everything else.”
Variant: Learn how to see. Realize that everything connects to everything else.
Quote of Ad Reinhardt (1963); as cited in: Joseph Kosuth, (1969), " Art after Philosophy http://www.ubu.com/papers/kosuth_philosophy.html"
1956 - 1967
Variant: The one thing to say about art is that it is one thing. Art is art-as-art and everything else is everything else. Art as art is nothing but art. Art is not what is not art.

Non-Fiction, English Literature: A Survey for Students (1958, revised 1974)
Source: Talking Science: Language, Learning, and Values. 1990, p. 175; as cited in: Hanuscin, Deborah L., and Michele H. Lee. "Teaching Against the Mystique of Science: Literature Based Approaches in Elementary Teacher Education." Learning, Teaching, and Curriculum presentations (MU) (2010).

Introduction to the Enlarged Edition
1940s, Foundations of Economic Analysis (1947; 1983)

शिक्षा (Education)
Context: In the fields of life there isn't any geometry. Here if whole is taken out from the whole then whole itself remains. Inside one is substance, inside atom is the world. Science cannot find everything and our psychological studies end within the darkness of intellect. This is why no teacher can teach.