“Time, we say, is Lethe; but change of air is a similar draught, and, if it works less thoroughly, does so more quickly.”

Press conference at an Alliance for Climate Protection meeting (12 October 2007), after winning the Nobel Peace Prize ( Video at YouTube http://www.youtube.com/watch?v=qlDDu8mgPYQ).

Book II, lines 1026–1029 (tr. Stallings)
De Rerum Natura (On the Nature of Things)

Page 178.
Possession (1990)

"Of What Use the Classics Today?," Begin Here: The Forgotten Conditions of Teaching and Learning (1991)
Context: The need for a body of common knowledge and common reference does not disappear when a society is pluralistic. On the contrary, it grows more necessary, so that people of different origins and occupation may quickly find familiar ground and as we say, speak a common language. It not only saves time and embarrassment, but it also ensures a kind of mutual confidence and goodwill. One is not addressing an alien, as blank as a stone wall, but a responsive creature whose mind is filled with the same images, memories, and vocabulary as oneself. Otherwise, with the unstoppable march of specialization, the individual mind is doomed to solitude and the individual heart to drying up.

Holidays in Hell (1989)

2016, Young Leaders of the Americas Initiative Town Hall (March 2016)
Context: I believe that under the surface all people are the same. […] people are all essentially the same. Similar hopes, similar dreams, similar strengths, similar weaknesses. But we're also all bound by history and culture and habits. And so conflicts arise, in part, because of some weaknesses in human nature. When we feel threatened, then we like to strike out against people who are not like us. When change is happening too quickly, and we try to hang on to those things that we think could give us a solid foundation. And sometimes the organizing principles are around issues like race, or religion. When there are times of scarcity, then people can turn on each other. And so I don't underestimate the very real challenges that we continue to face, and I don't think it is inevitable that the world comes together in a common culture and common understanding. But overall, I am hopeful. And the reason I'm hopeful is, if you look at the trajectory of history, humanity has slowly improved.

Sparks
The Note-Books of Samuel Butler (1912), Part XIV - Higgledy-Piggledy
Context: Everything matters more than we think it does, and, at the same time, nothing matters so much as we think it does. The merest spark may set all Europe in a blaze, but though all Europe be set in a blaze twenty times over, the world will wag itself right again.

§ 39
Reflections on the Formation and Distribution of Wealth (1766)
Context: All is more or less proper to serve as a common measure, in proportion as it is more or less in general use, of a more similar quality, and more easy to be divided into aliquot parts. All is more or less applicable for the purpose of a general pledge of exchange, in proportion as it is less susceptible of decay or alteration in quantity or quality.

Esthétique du Mal (1944)
Context: One might have thought of sight, but who could think
Of what it sees, for all the ill it sees?
Speech found the ear, for all the evil sound,
But the dark italics it could not propound.
And out of what sees and hears and out
Of what one feels, who could have thought to make
So many selves, so many sensuous worlds,
As if the air, the mid-day air, was swarming
With the metaphysical changes that occur,
Merely in living as and where we live.