“So many things are possible just as long as you don't know they're impossible.”
Variant: So many things are possible as long as you don't know they're impossible.
Source: The Phantom Tollbooth
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Norton Juster 40
American children's writer, academic, and architect 1929Related quotes

“There are many things that seem impossible only so long as one does not attempt them.”
Si le grain ne meurt [If It Die] (1924), ch. III
Source: Autumn Leaves

Interview with Stephen J. Dubner, for 'Freakonomics Radio' podcast (24 March 2010)
Context: Within my first meeting when I proposed to introduce the flat tax in Estonia they looked on me as I am a little bit crazy. And asked “do you know something on the economy?” and I answer “economically, no not so much.” But I think this is a great idea because it looks to work. And I didn’t know then that I would be the first one to see this, but I introduced it. I was 32, I was young and crazy, so I didn’t know what is possible and what's not, so I did impossible things.

Source: Testimony: its Posture in the Scientific World (1859), p. 14

“An impossibility is just a possibility you don’t understand yet”
Source: A Boy Called Christmas