
“Knock Knock. Who's there? The Truth. No joke.”
[Paulson, Dave, John Crist: A Christian comedian who's gently poking fun at faith, https://www.tennessean.com/story/entertainment/2019/04/11/john-crist-christian-comedian-nashville-comedy-festival-ryman-auditorium/3215394002/, 6 September 2019, The Tennessean, April 11, 2019, en]
“Knock Knock. Who's there? The Truth. No joke.”
James Burgh, in The Dignity of Human Nature, Or, A Brief Account of the Certain and Established Means for Attaining the True End of Our Existence (1754); this is very widely misattributed to Mann, appearing at least as early as the publication of Thoughts Selected from the Writings of Horace Mann (1867) edited by Mary Mann.
Misattributed
Variant in other editions: Do not think of knocking out another person's brains, because he differs in opinion from you; it will be as rational to knock yourself on the head because you differ from what you thought ten years ago.
The Dignity of Human Nature (1754)
Charlotte Cripps (January 31, 2007) "Stand up and be counted, comedians", The Independent.
On his duet with Kate on his song "Don’t Give Up", on his album So
The Kate Bush Story (2014)
As quoted in My Love Affair with David Lynch and Peachy Like Nietzsche: Dark Clown Porn Snuff for Terrorists and Gorefiends (2005) by Jason Rogers, p. 7
Context: I don't think that people accept the fact that life doesn't make sense. I think it makes people terribly uncomfortable. It seems like religion and myth were invented against that, trying to make sense out of it.
Hardball with Chris Matthews (15 July 2002), as quoted in The World According to Trump (2005) by Ken Lawrence, p. 23
2000s
David Albright, Glanville looking for a little more action at Portland State http://sports.espn.go.com/ncf/preview07/columns/story?id=2967161, ESPN.com, August 9, 2007.