Source: How to Win Friends and Influence People
“Beware of rashness, but with energy and sleepless vigilance go forward and give us victories.”
Letter to Major General http://www.historyplace.com/lincoln/lett-4.htm Joseph Hooker (26 January 1863)
1860s
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Abraham Lincoln 618
16th President of the United States 1809–1865Related quotes

How—and How Not—to Love Mankind http://www.city-journal.org/html/11_3_urbanities-how_and_how_no.html (Summer 2001).
City Journal (1998 - 2008)

“Ignorance is a low-energy state. It takes constant vigilance and work to climb out of it.”
SGU, Podcast #352 – April 14th, 2012 http://www.theskepticsguide.org/podcast/sgu/352
The Skeptics' Guide to the Universe, Podcast, 2010s

reportedly during a 1974 speech to the United Nations, as reported by Loonwatch on 25 March 2017 http://www.loonwatch.com/2017/03/25/the-1974-houari-boumedienne-u-n-speech-myth/
Misattributed

“Fear tries to get us to give up but faith takes us all the way through to victory”