“Double, double, toil and trouble;
Fire burn, and cauldron bubble!”

Source: The Princess Bride

The Tables Turned.
Bartlett's Familiar Quotations, 10th ed. (1919)

Source: The Angel Experiment

Her Honeymoon; reported in Bartlett's Familiar Quotations, 10th ed. (1919).
20th century

Mirrors and shade
Song lyrics, Mirrors And Shade (2002-2004)

Homily at the morning Mass at the Casa Santa Marta (23 February 2017), as quoted in "Pope: Don't put off conversion, give up a double life" at Vatican Radio (23 February 2017) http://en.radiovaticana.va/news/2017/02/23/pope_dont_put_off_conversion,_give_up_a_double_life/1294470; also quoted in "Did Pope Francis Say It Was Better to Be an Atheist Than a Bad Catholic? at snopes.com (28 February) http://www.snopes.com/pope-francis-bad-catholics/
2010s, 2017
Context: What is scandal? Scandal is saying one thing and doing another; it is a double life, a double life. A totally double life: "I am very Catholic, I always go to Mass, I belong to this association and that one; but my life is not Christian, I don’t pay my workers a just wage, I exploit people, I am dirty in my business, I launder money …" A double life. And so many Christians are like this, and these people scandalize others. How many times have we heard — all of us, around the neighborhood and elsewhere — "but to be a Catholic like that, it’s better to be an atheist." It is that, scandal. You destroy. You beat down. And this happens every day, it’s enough to see the news on TV, or to read the papers. In the papers there are so many scandals, and there is also the great publicity of the scandals. And with the scandals there is destruction.

The Great Movies II (2005), p. 94
Context: It's said that Chaplin wanted you to like him, but Keaton didn't care. I think he cared, but was too proud to ask. His films avoid the pathos and sentiment of the Chaplin pictures, and usually feature a jaunty young man who sees an objective and goes for it in the face of the most daunting obstacles. Buster survives tornados, waterfalls, avalanches of boulders, and falls from great heights, and never pauses to take a bow: He has his eye on his goal. And his movies, seen as a group, are like a sustained act of optimism in the face of adversity; surprising, how without asking, he earns our admiration and tenderness.
Because he was funny, because he wore a porkpie had, Keaton's physical skills are often undervalued … no silent star did more dangerous stunts than Buster Keaton. Instead of using doubles, he himself doubled for his actors, doing their stunts as well as his own.

Yarrow Unvisited.
Bartlett's Familiar Quotations, 10th ed. (1919)

Vol. 2, Essais et Notes
The Lie of the Truth (1938)