I'm working on a history of data visualization in which some works from the 1900 “Exhibit of American Negroes” at the Paris World Fair (the Exposition Universelle Internationale) are featured. A nice quote, attributed to him was found at https://www.brainyquote.com/quotes/w_e_b_du_bois_120759
When you have mastered numbers, you will in fact no longer be reading numbers, any more than you read words when reading books. You will be reading meaning.
It is a great quote for the purpose, but was challenged by an editor. Any hints for tracking down the source of this quote would be appreciated.