In her biography on Voltaire, Hall wrote the phrase: "I disapprove of what you say, but I will defend to the death your right to say it" (which is often misattributed to Voltaire himself) as an illustration of Voltaire's beliefs. Hall's quotation is often cited to describe the principle of freedom of speech.
Hall appeared to be an important influence in the life of her brother-in-law, Hugh Stowell Scott (pseudonym Henry Seton Merriman). Upon his death in 1903, Scott left £5,000 to Hall, writing that it was "in token of my gratitude for her continued assistance and literary advice, without which I should never have been able to have made a living by my pen." 
^Boller, Jr., Paul F.; George, John (1989). They Never Said It: A Book of Fake Quotes, Misquotes, and Misleading Attributions. New York: Oxford University Press. ISBN0-19-505541-1.Cite uses deprecated parameters (help)