"That is the worst idea... since Abraham Lincoln said, ‘I'm sick of kicking around the house all day, let's go take in a show.’"

Edmund Blackadder in Black Adder Goes Forth [it turns out he actually called it “the worst idea in the history of entertainment” according to https://www.imdb.com/title/tt0526713/characters/nm0000100 - such are the perils of checking quotations].

“I no longer think of it as [writer’s] block. I think that is looking at the problem from the wrong angle. If your wife locks you out of the house, you don’t have a problem with your door.”

Anne Lamott Some Instructions on Writing and Life (her point being that you’re not blocked from getting something out that is inside you, you’re empty)

“All in all, I cannot say enough good things about this candidate or recommend him too highly.”

Another in the “He's an extraordinary man” series of double-edged letter of recommendation phrases that is found in multiple places on the Internet; I do not know the origin.

Something has been “making you behave as if we were distant acquaintances and you were trying to increase the distance.”
One of the characters in P.G. Wodehouse Do Butlers Burgle Banks?

“It is impossible to insult a man who is not unsure of himself.”

Robert Heinlein quoted in Spider Robinson Time Travelers Strictly Cash

“** Fop cit.”

Footnote to the second mention of John Kerry in the Wall St. Journal's “OpinionJournal” August 25, 2005

“Our saying of the week: ‘What doesn’t kill you…’ “‘May try again later’”.

The cow and sheep in the comic strip “The Barn” by Ralph Hagen Feb. 16, 2020 (https://www.gocomics.com/thebarn/2020/02/16)

“sailors pressed into the service… whose skills and fidelity were equally suspicious.”

Edward Gibbon Decline and Fall of the Roman Empire