“It is possible for the human spirit to win after all.”

On The Crucible, in a 1987 interview; as quoted in "Arthur Miller, Moral Voice of American Stage, Dies at 89" by Marilyn Berger in The New York Times (11 February 2005) http://www.nytimes.com/2005/02/11/theater/newsandfeatures/11cnd-miller.html?ei=5070&en=3842d0df3195ba4c&ex=1148356800&adxnnlx=1148209567-ZnjnGzbndB3P1XvCU5BNDg&pagewanted=all&position=
Context: I was very moved by that play once again when the Royal Shakespeare Company did a production that toured the cathedrals of England. Then they took it to Poland and performed it in the cathedrals there, too. The actors said it changed their lives. Officials wept; they were speechless after the play, and everyone knew why. It was because they had to enforce the kind of repression the play was attacking. That made me prouder than anything I ever did in my life. The mission of the theater, after all, is to change, to raise the consciousness of people to their human possibilities.

Go Rin No Sho (1645), The Fire Book

Source: " The Poet of Pessimism https://www.henrysalt.co.uk/library/essay/the-poet-of-pessimism/", Vegetarian Review, August 1896
Context: We work for an ideal, not because we believe the ideal is destined to be triumphant, but because we are impelled so to work, and cannot, without violence to our best instincts, act otherwise. We protest against cruelty and injustice for the same reason, not merely because we feel that the dawn of a better day is at hand, but because such a protest has to be made, and we know intuitively that we must help to make it. Of the event we can have no absolute assurance—it rests for other minds and other hands than our—but we can at least be assured that we have done what was natural and inevitable to us, and that, whether successful or unsuccessful, there was no other course for a thoughtful man to take.

The Soul-Winner (1895)

Source: Ender's Game

Peace and Bread in Time of War (1922), Chapter 7 : Personal Reactions During War
Context: What after all, has maintained the human race on this old globe despite all the calamities of nature and all the tragic failings of mankind, if not faith in new possibilities, and courage to advocate them. Doubtless many times these new possibilities were declared by a man who, quite unconscious of courage, bore the "sense of being an exile, a condemned criminal, a fugitive from mankind." Did every one so feel who, in order to travel on his own proper path had been obliged to leave the traditional highway?

Go Rin No Sho (1645), The Fire Book

"The Adopted Father", Isaac Asimov's Science Fiction Magazine (1980), Reprinted in Gene Wolfe, Gene Wolfe's Book of Days (1981), Reprinted in Gene Wolfe, Castle of Days (1992)
Fiction

Go Rin No Sho (1645), The Water Book
Context: You can win with certainty with the spirit of "one cut". It is difficult to attain this if you do not learn strategy well. If you train well in this Way, strategy will come from your heart and you will be able to win at will. You must train diligently.