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Re: Who said that?

If we're thinking of the same quote, then Alan Perlis said that,
and it goes like:

"You think you know when you learn, are more sure when you can
write, even more when you can teach, but certain when you can

I thought it was printed somewhere in SICP, but I may be
mistaken...  :-)

----- Original Message -----
From: "Aaron Leung" <akhleung@earthlink.net>
To: <ll1-discuss@ai.mit.edu>
Sent: Friday, July 18, 2003 12:25 AM
Subject: Who said that?

Hi everyone,

there's a quote whose source and exact wording I can't recall.
sentiment goes something like: "When you read about it, [blank];
you can teach it, [another blank]; when you can program it, you
understand."  Does anyone know what this quote is?