
“I warn you, be careful and consider the consequences of your vote.”
As quoted in His Brother's Blood: Speeches and Writings, 1838–64 https://web.archive.org/web/20160319090634/https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA220#v=onepage&q&f=false (2004), edited by William Frederick Moore and Jane Ann Moore, p. 220
1860s, Speech (September 1860)