“The absurdity of both these propositions shows that they cannot refer to our world.”

Citizenship Papers (2003), The Failure of War

Friday (1983)

Introduction to the "Corners on the Curving Sky" section of the book Soulscript (1970) compiled by Jordan. These lines have been widely published in verse format as work misattributed to Gwendolyn Brooks, usually as a poem titled "Corners on the Curving Sky." One website http://web.archive.org/20090809112040/www.geocities.com/juscurious/anon.html indicated that Brooks had publicly repudiated the attribution of these lines to her, but the misattribution seems to have long remained largely unrecognized.
Context: Our earth is round, and, among other things, that means that you and I can hold completely different points of view and both be right. The difference of our positions will show stars in your window I cannot even imagine. Your sky may burn with light, while mine, at the same moment, spreads beautiful to darkness. Still we must choose how we separately corner the circling universe of our experience. Once chosen, our cornering will determine the message of any star and darkness we encounter. These poems speak to philosophy; they reveal the corners where we organize what we know.

The above statements have been widely published in the above format as lines of verse attributed to Brooks, usually as a poem titled "Corners on the Curving Sky" — but one website http://web.archive.org/20090809112040/www.geocities.com/juscurious/anon.html indicated that she declared she did not write them. The words actually occur as an introduction to the "Corners on the Curving Sky" section of the book Soulscript (1970) compiled by June Jordan, in which other poems of Brooks were included, and thus is apparently the work of Jordan. It appears simply in paragraph form and reads thus:
Misattributed, "Corners on the Curving Sky"
Context: Our earth is round, and, among other things
That means that you and I can hold completely different
Points of view and both be right.
The difference of our positions will show
Stars in your window I cannot even imagine.
Your sky may burn with light,
While mine, at the same moment,
Spreads beautiful to darkness.

Great Books: The Foundation of a Liberal Education (1954)

Quoted on BGR (February 7, 2016), "India ready to offer assistance to Sri Lanka in IT sector: Sushma Swaraj" http://www.bgr.in/news/india-ready-to-offere-assistance-to-sri-lanka-in-it-sector-sushma-swaraj/

"A Community of the Free" address at the The Foreign Policy Association NY, NY (23 June 1976); this is often paraphrased: We cannot be both the world’s leading champion of peace and the world’s leading supplier of the weapons of war.
Pre-Presidency
Context: Sometimes we try to justify this unsavory business on the cynical ground that by rationing out the means of violence we can somehow control the world’s violence. The fact is that we cannot have it both ways. Can we be both the world’s leading champion of peace and the world’s leading supplier of the weapons of war?

p, 125
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)

citation needed
The Late Late Show with Craig Ferguson (2005–2014), "Welcome Back" variations