“Earth, the world, the fifth planet from the sun—the species that stands on two legs and roams this thin wet crust: it’s changing, Lobey. It’s not the same. Some people walk under the sun and accept that change, others close their eyes, clap their hands to their ears, and deny the world with their tongues.”

The Canton, Ohio Speech, Anti-War Speech (1918)
Context: And now for all of us to do our duty! The clarion call is ringing in our ears and we cannot falter without being convicted of treason to ourselves and to our great cause.
Do not worry over the charge of treason to your masters, but be concerned about the treason that involves yourselves. Be true to yourself and you cannot be a traitor to any good cause on earth.
Yes, in good time we are going to sweep into power in this nation and throughout the world. We are going to destroy all enslaving and degrading capitalist institutions and re-create them as free and humanizing institutions. The world is daily changing before our eyes. The sun of capitalism is setting; the sun of socialism is rising. It is our duty to build the new nation and the free republic.

Heaven and Earth (2009)

As quoted in The Discovery of Nature (1965), by Albert W. Bettex
Context: There are countless suns and countless earths all rotating round their suns in exactly the same way as the seven planets of our system. We see only the suns because they are the largest bodies and are luminous, but their planets remain invisible to us because they are smaller and non-luminous. The countless worlds in the universe are no worse and no less inhabited than our earth. For it is utterly unreasonable to suppose that those teeming worlds which are as magnificent as our own, perhaps more so, and which enjoy the fructifying rays of a sun just as we do, should be uninhabited and should not bear similar or even more perfect inhabitants than our earth. The unnumbered worlds in the universe are all similar in form and rank and subject to the same forces and the same laws. Impart to us the knowledge of the universality of terrestrial laws throughout all worlds and of the similarity of all substances in the cosmos! Destroy the theories that the earth is the center of the universe! Crush the supernatural powers said to animate the world, along with the so-called crystalline spheres! Open the door through which we can look out into the limitless, unified firmament composed of similar elements and show us that the other worlds float in an ethereal ocean like our own! Make it plain to us that the motions of all the worlds proceed from inner forces and teach us in the light of such attitudes to go forward with surer tread in the investigation and discovery of nature! Take comfort, the time will come when all men will see as I do.

Source: The Martyrdom of Man (1872), Chapter IV, "Intellect"

Letter to a Friend (circa 1656)

"A Sad Heart at the Supermarket," Daedalus, vol. 89, no. 2 (Spring 1960); published in A Sad Heart at the Supermarket (1962)
General sources

Card XII : The Hanged Man http://www.sacred-texts.com/tarot/sot/sot23.htm
The Symbolism of the Tarot (1913)
Context: And then I saw a man in terrible suffering, hung by one leg, head downward, to a high tree. And I heard the voice: —
"Look! This is a man who saw Truth. Suffering awaits the man on earth, who finds the way to eternity and to the understanding of the Endless.
"He is still a man, but he already knows much of what is inaccessible even to Gods. And the incommensurableness of the small and the great in his soul constitutes his pain and his golgotha.
"In his own soul appears the gallows on which he hangs in suffering, feeling that he is indeed inverted.
"He chose this way himself.
"For this he went over a long road from trial to trial, from initiation to initiation, through failures and falls.
"And now he has found Truth and knows himself.
"He knows that it is he who stands before an altar with magic symbols, and reaches from earth to heaven; that he also walks on a dusty road under a scorching sun to a precipice where a crocodile awaits him; that he dwells with his mate in paradise under the shadow of a blessing genius; that he is chained to a black cube under the shadow of deceit; that he stands as a victor for a moment in an illusionary chariot drawn by sphinxes; and that with a lantern in bright sunshine, he seeks for Truth in a desert.
"Now he has found Her."

Source: For Whom the Bell Tolls