On the rumors that he had written a series of letters to a newspaper using the name Wanda Tinasky, in a phone call to CNN (5 June 1997)
“Never before have I written so long a letter. I'm afraid it is much too long to take your precious time. I can assure you that it would have been much shorter if I had been writing from a comfortable desk, but what else can one do when he is alone in a narrow jail cell, other than write long letters, think long thoughts, and pray long prayers?”
1960s, (1963)
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Martin Luther King, Jr. 658
American clergyman, activist, and leader in the American Ci… 1929–1968Related quotes

“I made this [letter] very long, because I did not have the leisure to make it shorter.”

in his first meeting with the press during visit by US Secretary of state John Kerry in July 2016 "Theresa May dodges question about Boris Johnson's use of racial slurs" http://www.independent.co.uk/news/uk/politics/pmqs-theresa-may-boris-johnson-racist-slur-picanninies-party-kenyan-obama-dodges-question-uk-foreign-a7146126.html, Independent (July 20, 2016); "Kerry poker-faced as press takes Johnson to task for 'outright lies'" http://edition.cnn.com/2016/07/20/politics/boris-johnson-john-kerry-presser/index.html, CNN (July 20, 2016)
2010s, 2016

Take up home gardening!"
Bring Me a Unicorn (1971)

“I would have written a shorter letter, but I did not have the time.”
Often misattributed to Twain, this is actually by Blaise Pascal, "Lettres provinciales", letter 16, 1657:
Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu le loisir de la faire plus courte.
Translation: I have only made this [letter] longer, because I have not had the opportunity to make it shorter.
Misattributed
Source: The Provincial Letters