“How strange it is that people of honest feelings and sensibilty, who would not take advantage of a man born without arms or legs or eyes—how such people think nothing of abusing a man with low intelligence.”

Source: All the Pretty Horses

(from vol 1, letter 38: 1 Sep 1776, to Mr M___ ) [the quotation is from Alexander Pope's poem "1738" (now usually known as "Epilogue to the Satires, dialogue 1"), referring to postal reformer and philanthropist Ralph Allen]

Source: A Lesson Before Dying

"Recalling War," lines 1–6, from Collected Poems 1938 (1938).
Poems

Space (1912)
Context: Remember his mind and no other part of him lived in his new world. He said it gave him an odd sense of detachment to sit in a room among people, and to know that nothing there but himself had any relation at all to the infinite strange world of Space that flowed around them. He would listen, he said, to a great man talking, with one eye on the cat on the rug, thinking to himself how much more the cat knew than the man.

"Honest People Have Rights, Too" (8 February 1960).
Scientology Bulletins

"Three Methods Of Reform" in Pamphlets : Translated from the Russian (1900) as translated by Aylmer Maude, p. 29
As quoted in The Artist's Way at Work : Riding the Dragon (1999) by Mark A. Bryan with Julia Cameron and Catherine A. Allen, p. 160
Variant: Everyone thinks of changing the world, but no one thinks of changing himself.

Part III: Man and Himself, Ch. 16: Ideas Which Have Become Obsolete, p. 158
Source: 1950s, New Hopes for a Changing World (1951)