“Having not said anything the first time, it was somehow even more difficult to broach the subject the second time around.”
Source: So Long, and Thanks for All the Fish
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Douglas Adams 317
English writer and humorist 1952–2001Related quotes

Dell, Diana. Memorable Quotations: Humorists, Wits, and Satirists of the Past, p. 54 http://books.google.com/books?id=IhgDPQvUM6YC&pg=PA54. iUniverse, 2000. ISBN 0595165958
Attributed

as quoted by [Steven Chu and Charles H. Townes, Biographical Memoirs V.83, National Academies Press, 2003, 0-309-08699-X, 201]

“You're truly free for the first time. What could be more difficult than that?”
The Book of Martha
Bloodchild and Other Stories (1995)

Quoted in Time magazine (13 June 1988).
Books, articles, and speeches
“First time it's a stranger. Second time its just a coincidence. Third time it's a tail”
Source: Cross My Heart and Hope to Spy

“The first time flee; the second time, flee; and the third, become like a sword.”
Saying 140

As quoted in: J.Muller, Physical Chemistry in Depth (Springer Science & Business Media, 1992), p. 1. No primary source is given in that book.
Disputed