[I do not] carry such information in my mind since it is readily available in books. ...The value of a college education is not the learning of many facts but the training of the mind to think.

In response to not knowing the speed of sound as included in the Edison Test: New York Times (18 May 1921); Einstein: His Life and Times (1947) Philipp Frank, p. 185; Einstein, A Life (1996) by Denis Brian, p. 129; "Einstein Due Today" (February 2005) edited by József Illy, Manuscript 25-32 of the Einstein Paper Project; all previous sources as per Einstein His Life and Universe (2007) by Walter Isaacson, p. 299

Unsourced variants: "I never commit to memory anything that can easily be looked up in a book" and "Never memorize what you can look up in books." (The second version is found in "Recording the Experience" (10 June 2004) at The Library of Congress, but no citation to Einstein's writings is given).