
“I am always doing that which I can not do, in order that I may learn how to do it.”
Attributed in Civilization's Quotations : Life's Ideal (2002) by Richard Alan Krieger, p. 132, and many places on the internet, this was actually stated by Vincent van Gogh in a letter to Anthon van Rappard http://en.wikipedia.org/wiki/Anthon_van_Rappard (18 August 1885) http://vangoghletters.org/vg/letters/let528/letter.html, also rendered "I keep on making what I can’t do yet in order to learn to be able to do it."
Misattributed
Variant: I am always doing that which I cannot do, in order that I may learn how to do it.