“It is better to debate a question without settling it than to settle a question without debating it.”

Source: Speech in the House of Commons (14 May 1866)

Aliens Cause Global Warming (2003)
Context: I want to pause here and talk about this notion of consensus, and the rise of what has been called consensus science. I regard consensus science as an extremely pernicious development that ought to be stopped cold in its tracks. Historically, the claim of consensus has been the first refuge of scoundrels; it is a way to avoid debate by claiming that the matter is already settled.

After the German Ambassador persistently brought up the Armenian question in 1918. Quoted in The History of the Armenian Genocide (2003) by Vahakn N. Dadrian, p. 211

Provisional Constitution and Ordinances (1858), Prison interview (1859)

"Theories of the Universe" (10 Apr 1958)

Southey's Colloquies on Society (1830)

1961, Address to ANPA
Context: Without debate, without criticism, no Administration and no country can succeed — and no republic can survive. That is why the Athenian lawmaker Solon decreed it a crime for any citizen to shrink from controversy. And that is why our press was protected by the First Amendment — the only business in America specifically protected by the Constitution- -not primarily to amuse and entertain, not to emphasize the trivial and the sentimental, not to simply "give the public what it wants" — but to inform, to arouse, to reflect, to state our dangers and our opportunities, to indicate our crises and our choices, to lead, mold, educate and sometimes even anger public opinion.
This means greater coverage and analysis of international news — for it is no longer far away and foreign but close at hand and local. It means greater attention to improved understanding of the news as well as improved transmission. And it means, finally, that government at all levels, must meet its obligation to provide you with the fullest possible information outside the narrowest limits of national security — and we intend to do it.

Between the Bridge and the River (2006)