“In today's Britain, the idea that there could be a Constitution more powerful - and even sacrosanct - than any crowned head or elected politician (thus abolishing the false antithesis between hereditary monarchs and capricious presidents) is thought of as a breathtakingly new and daring idea.”

6 October 1996 "Down With the Presidency"
1990s

The Rediff Interview/R Venkataraman

Regarding using the words "slave" or "slavery" within the U.S. Constitution, in Madison's notes (25 August 1787)
Variants:
Madison, in convention, when an attempt was made to introduce the term slave into the Constitution, said: "It must not be so; because we intend this Constitution to be the great charter of human liberty to the unborn millions who shall enjoy its protection, and who should never see that such an institution as slavery has ever known in our midst."
As paraphrased or quoted in Our National Condition, and Its Remedy : A Sermon, Preached in the Pine Street Church, Boston, on Sunday, June 22, 1856 (1856) https://archive.org/details/ournationalcondi00dext by Henry Martyn Dexter
Madison said he "thought it wrong to admit in the Constitution the idea that there could be property in man. We intend this Constitution to be the great charter of human liberty to the unborn millions who may enjoy its protection, and who shall never see that such an institution was ever known in their midst.
As paraphrased or quoted in Reminiscences of James A. Hamilton: Or, Men and Events, at Home and Abroad (1869), Appendix D, Property in Man, p. 625 https://books.google.com/books?id=0uQEAAAAYAAJ&pg=PA625#v=twopage&q&f=false
1780s, The Debates in the Federal Convention (1787)
Context: Mr. MADISON thought it wrong to admit in the Constitution the idea that there could be property in men. The reason of duties did not hold, as slaves are not like merchandize, consumed, &c

1911 - 1914, The 'Savages' of Germany' (1912)

Wikinews interview with Tony Benn (8 August 2007), quote from approx 24min45 sec into interview.
2000s

Part 1.3 Rights of Man
1790s, Rights of Man, Part I (1791)

Interview with Conrad Bodman, curator at the Barbican Arts Centre (2001)
Context: Ideas must be put to the test. That's why we make things, otherwise they would be no more than ideas. There is often a huge difference between an idea and its realisation. I've had what I thought were great ideas that just didn't work. Sometimes it's difficult to say if something has worked or not. Photography is a way of putting distance between myself and the work which sometimes helps me to see more clearly what it is that I have made.

Introduction : The Libertarian Tradition
Communalism (1974)
Context: People who believe in libertarian communism can be grouped roughly under three general theories, each with its old masters, theoreticians, leaders, organizations, and literature. First there are the anarchists in a rather limited variety: communist-anarchists, mutualists, anarcho-syndicalists, individual anarchists, and a few minor groups and combinations. Second, the members of intentional communities, usually but by no means always religious in inspiration. The words “communalism” and “communalist” seem to have died out and it would be good to appropriate them to this group, although the by now too confusing word “communist” actually fits them best of all. Third, there are the Left Marxists, who prior to 1918 had become a widespread movement challenging the Social Democratic Second International. It was to them the Bolsheviks appealed for support in the early days of their revolution. Lenin’s The State and Revolution is an authoritarian parody of their ideas. They in turn have called it “the greatest pre-election pamphlet ever written: ‘Elect us and we will wither away’.” Against them Lenin wrote Leftism: An Infantile Disorder. There is a story that, when the Communist International was formed, a delegate objected to the name. Referring to all these groups he said: “But there are already communists.” Lenin answered: “Nobody ever heard of them, and when we get through with them nobody ever will.” Today these ideas are more influential than they ever have been.

Gwen Novak (Hazel Stone); chapter 18, p. 230
The Cat Who Walks Through Walls (1985)
Context: The hardest part about gaining any new idea is sweeping out the false idea occupying that niche. As long as that niche is occupied, evidence and proof and logical demonstration get nowhere. But once the niche is emptied of the wrong idea that has been filling it — once you can honestly say, "I don't know", then it becomes possible to get at the truth.