“You can never fool an audience.”

As quoted in The Fabulous Fanny : The Story of Fanny Brice (1953) by Norman Katkov, p. 71
Context: Your audience gives you everything you need. They tell you. There is no director who can direct you like an audience. You step out on the stage and you can feel it is a nervous audience. So you calm them down. I come out before an audience and maybe my house burned down an hour ago, maybe my husband stayed out all night, but I stand there. I'm still. I don't move. I wait for the introduction. Maybe I cough. Maybe I touch myself. But before I do anything, I got them with me, right there in my hand and comfortable. That's my job, to make them comfortable, because if they wanted to be nervous they could have stayed home and added up their bills.

Source: Short fiction, Dragonfield and Other Stories (1985), The Bull & the Crowth (p. 122)

Source: Getting Things Done: The Art of Stress-Free Productivity

Arundhati Roy: They are trying to keep me destabilised. Anybody who says anything is in danger https://www.theguardian.com/books/2011/jun/05/arundhati-roy-keep-destabilised-danger, (5 June 2011)
Articles, Interviews

Source: Vorkosigan Saga, Falling Free (1988), Chapter 2 (p. 36)

This is probably the most famous of apparently apocryphal remarks attributed to Lincoln. Despite it being cited variously as from an 1856 speech, or a September 1858 speech in Clinton, Illinois, there are no known contemporary records or accounts substantiating that he ever made the statement. The earliest known appearance is October 29, 1886 in the Milwaukee Daily Journal http://anotherhistoryblog.blogspot.com/2009/02/fooling-people-earlier.html. It later appeared in the New York Times on August 26 http://query.nytimes.com/gst/abstract.html?res=F30817FF3E5413738DDDAF0A94D0405B8784F0D3 and August 27 http://query.nytimes.com/gst/abstract.html?res=F00E15FF3E5413738DDDAE0A94D0405B8784F0D3, 1887. The saying was repeated several times in newspaper editorials later in 1887. In 1888 and, especially, 1889, the saying became commonplace, used in speeches, advertisements, and on portraits of Lincoln. In 1905 and later, there were attempts to find contemporaries of Lincoln who could recall Lincoln saying this. Historians have not, generally, found these accounts convincing. For more information see two articles in For the People: A Newsletter of the Abraham Lincoln Association, "'You Can Fool All of the People' Lincoln Never Said That", by Thomas F. Schwartz ( V. 5, #4, Winter 2003, p. 1 http://abrahamlincolnassociation.org/Newsletters/5-4.pdf) and "A New Look at 'You Can Fool All of the People'" by David B. Parker ( V. 7, #3, Autumn 2005, p. 1 http://abrahamlincolnassociation.org/Newsletters/7-3.pdf); also the talk page. The statement has also sometimes been attributed to P. T. Barnum, although no references to this have been found from the nineteenth century.
Variants:
You can fool all the people some of the time, and some of the people all of the time, but you cannot fool all of the people all of the time.
You can fool all of the people some of the time, and some of the people all of the time, but you can't fool all of the people all of the time.
You can fool all the people some time, you can fool some of the people all of the time, but you can not fool all the people all the time.
Disputed

Source: Navohar