“One hundred years from now Beatles songs may be so well known that every child will learn them as nursery rhymes, and most people will have forgotten who wrote them. They will have become sufficiently entrenched in popular culture that it will seem as if they've always existed, like Oh Susannah, This Land Is Your Land, and Frère Jacques.”

Language Education in a Knowledge Context (1980)
Context: The question, "How well does one read?" is a bad question... essentially unanswerable. A more proper question is "How well does one read poetry, or history, or science, or religion?" No one I have ever known is so brilliant as to have learned the languages of all fields of knowledge equally well. Most of us do not learn some of them at all.

"Rossa's Recollections 1838 to 1898: Memoirs of an Irish Revolutionary", p. 143

How Many People Can Live on Planet Earth? (BBC Horizon, 2009)

Sheikh Al-Qaradhawi Reacts to the Murder of Four Americans in Al-Fallujah: 'How could you punish an entire people because four corpses were mutilated?' http://www.memritv.org/clip_transcript/en/31.htm April 2004.

A System of Logic (1843)

"Conservation" (c. 1938); Published in Round River, Luna B. Leopold (ed.), Oxford University Press, 1966, p. 155.
1930s
Source: Round River: From the Journals of Aldo Leopold

In The Light of what We Know (2014)

"Keep Moving from this Mountain" http://www5.spelman.edu/about_us/news/pdf/70622_messenger.pdf – Founders Day Address at the Sisters Chapel, Spelman College (11 April 1960)
1960s
Context: In every age and every generation men have envisioned some promised land. Plato envisioned it in his republic as a time when justice would reign throughout society and philosophers would become kings and kings philosophers. Karl Marx envisioned it as a classless society in which the proletariat would finally conquer the reign of the bourgeoisie; out of that idea came the slogan, “from each according to his ability, to each according to his need.” Bellamy, in Looking Backward, thought of it as a day when the inequalities of monopoly capitalism would pass away. Society would exist onthe basis of evenness of economic output. Christianity envisioned it as the Kingdom of God, a time when the will of God will reign supreme, and brotherhood, love, and right relationships will be the order of society. In every age and every generation men have dreamed of some promised land of fulfillment of freedom. Whether it was the right promised land or not, they dreamed of it. But in moving from some Egypt of slavery, whether in the intellectual, cultural or moral realm, toward some promised land, there is always the same temptation. Individuals will get bogged down in a particular mountain in a particular spot, and thereby become the victims of stagnant complacency. So, this afternoon, I would like to deal with three or four symbolic mountains that we have been in long enough-mountains that we must move out of if we are to go forward in our world and if civilization is to survive.

"An Unread Book," introduction to The Man Who Loved Children by Christina Stead (Holt, Rinehart, 1965 edition)
General sources