As quoted in Telephony, Vol. 150 (1956), p. 23 http://books.google.com/books?id=Wm0jAQAAMAAJ&q=%22being+able+to+differentiate+between+what+you+do+know%22&dq=%22being+able+to+differentiate+between+what+you+do+know%22&hl=en&sa=X&ei=qYJOU9dAzoXRAYumgcAP&ved=0CMsCEOgBMDQ; the first two sentences of this statement began to be attributed to Anatole France in the 1990s, but without any citations of sources.
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