What poem contains the line, "Things fall apart; the center cannot hold"?

William Butler Yeats’s “The Second Coming” (1920) contains the line, “Things fall apart; the center cannot hold”.

Who wrote “Water, Water, everywhere/Nor any drop to drink”? Samuel Taylor Coleridge wrote "Water, Water, everywhere/Nor any drop to drink" in his poem "The Rime of the Ancient Mariner" (1798). The lines are often misquoted as "and not a drop to drink."
How did the kingdom of Oz get its name? Although some biographers believe the story of Oz's naming to be as fanciful as the tales themselves, author L. Frank Baum claimed that he was inspired by a file cabinet marked O–Z. Other…
How many dogs and cats are there in the United States? In 1988, the United States was home to 49.4 million dogs and 57.8 million cats. The percentage of American households owning dogs was 37.2; the percentage owning cats was 30.
How many women are quoted in Bartlett’s Familiar Quotations? Of the 2,200 persons quoted in the current edition of Bartlett's Familiar Quotations only 164 are women. This is an astronomical increase over the number quoted in the 1855 first edition of four.
When did the federal income tax become a permanent institution in the U.S.? The federal income tax in the U.S. has been permanent since 1913, with the passage of the 16th Amendment. As established in that year, the bottom rate was 1 percent on taxable net…
How many shares of stock were traded on Black Tuesday in 1929? On October 29, 1929, the date of the worst crash in Wall Street history, over 16 million shares of stock were traded on the New York Stock Exchange. That day, $8-9 billion in…