Aleksandr Solzhenitsyn quote: “It is unthinkable in the twentieth century to fail to distinguish between what constitutes an abominable atrocity that …”

“The layman's Constitutional view is that what he likes is Constitutional and that which he doesn't like is un-Constitutional. That about measures up the Constitutional acumen of the average person.”

Hugo Black (1886–1971) U.S. Supreme Court justice

News conference, Washington, D.C., reported in The New York Times (February 25, 1971), p. 38.

“Hold on, my friends, to the Constitution and to the Republic for which it stands. Miracles do not cluster and what has happened once in 6,000 years, may not happen again. Hold on to the Constitution, for if the American Constitution should fail, there will be anarchy throughout the world.”

Daniel Webster (1782–1852) Leading American senator and statesman. January 18, 1782 – October 24, 1852. Served as the Secretary of Sta…

The earliest version of this seems to be from Savings and Loan Annual 1963, p. 56 http://books.google.com/books?id=RckuAQAAIAAJ&q=%22hold+on+my+friends+to+the+constitution%22&dq=%22hold+on+my+friends+to+the+constitution%22&hl=en&ei=yCxETrWOLMn10gHCm5TbDA&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC0Q6AEwATgU published by the United States Savings and Loan League. Variants of it were quoted by President Ronald Reagan, here http://books.google.com/books?id=tfgIGkforucC&q=%22what+has+happened+once+in+6,000+years+may+never+happen+again%22&dq=%22what+has+happened+once+in+6,000+years+may+never+happen+again%22&hl=en&ei=ejxEToOHMsP20gGI8KHACQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC0Q6AEwADgK, here http://books.google.com/books?id=BOzui4UB1xEC&q=%22American+Constitution+shall+fall%22&dq=%22American+Constitution+shall+fall%22&hl=en&ei=Fz1ETvSWAeu80AH3jOHwCQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0CD8Q6AEwBA, and here http://books.google.com/books?id=tfgIGkforucC&q=%22miracles+do+not+cluster%22&dq=%22miracles+do+not+cluster%22&hl=en&ei=3D9ETs7ZNMXj0QHxkcn8CQ&sa=X&oi=book_result&ct=result&resnum=7&ved=0CEYQ6AEwBjgo, for example. A similar quote can be found in a speech by Edwin Meese, a longtime associate of Reagan, part of a 1986 book (pamphlet?), The Great debate: interpreting our written Constitution, page 56 http://books.google.com/books?id=HmVDAQAAIAAJ&q=%22miracles+do+not+cluster%22&dq=%22miracles+do+not+cluster%22&hl=en&ei=3D9ETs7ZNMXj0QHxkcn8CQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDcQ6AEwAzgo
Webster did say, in two different places and times, words that are similar enough to be the presumable basis of this misquote, though the phrase "the Republic for which it stands" is best known from its presence in The Pledge of Allegiance http://en.wikipedia.org/wiki/Pledge_of_Allegiance, written in 1892, about 40 years after Webster died. These are Webster's words:
Hold on, my friends, to the Constitution of your country and the government established under it. Leave evils which exist in some parts of the country, but which are beyond your control, to the all-wise direction of an over-ruling Providence. Perform those duties which are present, plain and positive. Respect the laws of your country." (1851 letter from Daniel Webster to Dr. William B. Gooch of West Dennis, Massachusetts, quoted in an 1898 publication of the Bay State Monthly http://books.google.com/books?id=LNwXAQAAIAAJ&pg=PA326&dq=%22hold+on+my+friends+to+the+constitution%22&hl=en&ei=_BxEToOjI-Lb0QGewPnACQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0CEEQ6AEwBA#v=onepage&q=%22hold%20on%20my%20friends%20to%20the%20constitution%22&f=false)
We live under the only government that ever existed, which was formed by the deliberate consultations of the people. Miracles do not cluster. That which has happened but once in six thousand years, cannot be expected to happen often. Such a government, once destroyed, would have a void to be filled, perhaps for centuries, with evolution and tumult, riot and despotism. (From an 1882 book http://books.google.com/books?id=DoCdsVIZzFMC&pg=PA14&dq=%22once+in+six+thousand+years%22+Webster&hl=en&ei=NjhETvblI9K_tgeU-PHDCQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC8Q6AEwAQ, which says it is printing an oration given by Webster in 1802; similar but not exactly the same wording can be found in The Granite monthly: a magazine of literature, history and state ...: Volume 5 - Page 7 http://books.google.com/books?id=wRYXAAAAYAAJ&pg=PA7&dq=%22miracles+do+not+cluster%22&hl=en&ei=6xhETtL9NuT30gGvo834CQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0CDwQ6AEwBA#v=onepage&q=%22miracles%20do%20not%20cluster%22&f=false, 1882, which said that it was printing an 1805 address given by Webster in Concord, Massachusetts.) [That Webster would use similar wording in separate orations could be expected, of course.]
The misquote is notable for the emphasis on the Constitution rather the government of the United States; for using the word "fail" (sometimes, "fall"), rather than "destroyed", which opens up a line of argument that Webster was concerned about the Constitution being misinterpreted, in legal cases; and that worldwide anarchy could result from something happening in the United States, something fairly unthinkable in the first half of the 19th century, when the United States was in no way an important country in international matters.
Misattributed

“I have the principles of an Englishman, and I utter them without apprehension or reserve…this is not the language of faction; let it be tried by that criterion, by which alone we can distinguish what is factious, from what is not—by the principles of the English constitution. I have been bred up in these principles, and I know that when the liberty of the subject is invaded, and all redress denied him, resistance is justifiable…the constitution has its political Bible, by which if it be fairly consulted, every political question may, and ought to be determined. Magna Charta, the Petition of Rights and the Bill of Rights, form that code which I call the Bible of the English constitution.”

William Pitt, 1st Earl of Chatham (1708–1778) British politician

Had some of his Majesty's unhappy predecessors trusted less to the commentary of their Ministers, and been better read in the text itself, the glorious Revolution might have remained only possible in theory, and their fate would not now have stood upon record, a formidable example to all their successors.
Speech in the House of Lords (22 January 1770), quoted in William Pitt, The Speeches of the Right Honourable the Earl of Chatham in the Houses of Lords and Commons: With a Biographical Memoir and Introductions and Explanatory Notes to the Speeches (London: Aylott & Jones, 1848), p. 98.

“So the written Constitution, the one we can see, fails to tell us just what's in it and what's not.”

Laurence Tribe (1941) American lawyer and law school professor

The Invisible Constitution (2008), Identifying "The Constitution"

“To understand this relationship we may start with what has become an accepted observation: Stalinized Bolshevism and National Socialism constitute the two examples of twentieth-century totalitarian regimes. Not only were they comparable, but they form a political category of their own, which has become established since Hannah Arendt.”

François Furet (1927–1997) French historian

Source: The Passing of an Illusion, The Idea of Communism in the Twentieth Century (1999), p. 180

“History always constitutes the relation between a present and its past. Consequently fear of the present leads to mystification of the past”

John Berger book Ways of Seeing

Source: Ways of Seeing

“As the past century was the century of capitalist power, the twentieth century is the century of power and glory of labour.”

Benito Mussolini (1883–1945) Duce and President of the Council of Ministers of Italy. Leader of the National Fascist Party and subsequen…

Four Speeches on the Corporate State, Rome, (1935) pp. 39-40. Speech delivered to the workers in Milan. Eric Jabbari, Pierre Laroque and the Welfare State in Postwar France, Oxford University Press, (2012) p. 46
Context: Fascism establishes the real equality of individuals before the nation… the object of the regime in the economic field is to ensure higher social justice for the whole of the Italian people… What does social justice mean? It means work guaranteed, fair wages, decent homes, it means the possibility of continuous evolution and improvement. Nor is this enough. It means that the workers must enter more and more intimately into the productive process and share its necessary discipline… As the past century was the century of capitalist power, the twentieth century is the century of power and glory of labour.