“Corruption, the most infallible symptom of constitutional liberty.”

Source: The Sword or the Cross, Which Should be the Weapon of the Christian Militant? (1921), Ch.4 p. 69-70
Context: None of us believes that rulers are infallible or that their commands should constitute our highest standard of right and wrong. Quite apart from the belief of the ruler, the method of war is either Christian or un-Christian, and his command does not determine whether our participation in it is moral or immoral. Therefore, the Christian citizen must come to his decision on a basis of the spirit and teaching of Jesus, quite independently of the command of the ruler. To say that Jesus and St. Paul recognize the function of the state is not to say that they command the Christian to participate in war when ordered to do so by the ruler of the nation; any more than their recognition of the state meant that they sanctioned human slavery, polygamy, extortion and the other evil practices which were approved by the [Roman] state.

The Dick Cavett Show (9 June 1978)

Speech before the Chamber of Commerce, Elmira, New York (3 May 1907); published in Addresses and Papers of Charles Evans Hughes, Governor of New York, 1906–1908 (1908), p. 139

Popular Government: Its Essence, Its Permanence and Its Perils, chapter 4, p.90 (1913).

Interview with Steve Harvey, quoted in "Clinton confuses Constitution with Declaration of Independence in gun pitch" http://www.foxnews.com/politics/2016/02/25/clinton-confuses-constitution-with-declaration-independence-in-gun-pitch.html, FoxNews.com (25 February 2016)
Presidential campaign (April 12, 2015 – 2016)

La sainteté des femmes est inconciliable avec les devoirs et les libertés du monde. Emanciper les femmes, c'est les corrompre.
Source: A Woman of Thirty (1842), Ch. III: At Thirty Years.

Speech at Edwardsville, Illinois (11 September 1858); quoted in Lincoln, Abraham; Mario Matthew Cuomo, Harold Holzer, G. S. Boritt, Lincoln on Democracy http://books.google.de/books?id=8bWmmyJEMZoC&pg=PA128 (Fordham University Press, September 1, 2004), 128. .
Variant of the above quote: What constitutes the bulwark of our own liberty and independence? It is not our frowning battlements, our bristling sea coasts, our army and our navy. These are not our reliance against tyranny All of those may be turned against us without making us weaker for the struggle. Our reliance is in the love of liberty which God has planted in us. Our defense is in the spirit which prizes liberty as the heritage of all men, in all lands everywhere. Destroy this spirit and you have planted the seeds of despotism at your own doors. Familiarize yourselves with the chains of bondage and you prepare your own limbs to wear them. Accustomed to trample on the rights of others, you have lost the genius of your own independence and become the fit subjects of the first cunning tyrant who rises among you.
Fragment of Speech at Edwardsville, Ill., September 13, 1858; quoted in Lincoln, Abraham; The Writings of Abraham Lincoln V05 http://www.classic-literature.co.uk/american-authors/19th-century/abraham-lincoln/the-writings-of-abraham-lincoln-05/ebook-page-05.asp) p. 6-7
1850s
Context: What constitutes the bulwark of our own liberty and independence? It is not our frowning battlements, our bristling sea coasts, the guns of our war steamers, or the strength our gallant and disciplined army? These are not our reliance against a resumption of tyranny in our fair land. All of those may be turned against our liberties, without making us weaker or stronger for the struggle. Our reliance is in the love of liberty which God has planted in our bosoms. Our defense is in the preservation of the spirit which prizes liberty as the heritage of all men, in all lands, everywhere. Destroy this spirit, and you have planted the seeds of despotism around your own doors. Familiarize yourselves with the chains of bondage and you are preparing your own limbs to wear them. Accustomed to trample on the rights of those around you, you have lost the genius of your own independence, and become the fit subjects of the first cunning tyrant who rises.

Source: The Ideological Origins of the American Revolution (1967), Chapter IV, THE LOGIC OF REBELLION, p. 138.