“Optimism is true moral courage.”

Source: Singularity Sky (2003), Chapter 11, “Circus of Death” (p. 234)

Mark Twain in Eruption: Hitherto Unpublished Pages About Men and Events (1940) edited by Bernard DeVoto

Source: Malfuzat,Vol.1,p.136 to 137

Phase the Fifth: The Woman Pays, ch. XLIII
Tess of the d'Urbervilles (1891)

Section 9 : Ethical Outlook
Founding Address (1876), Life and Destiny (1913)
Context: Theologians often say that faith must come first, and that morality must be deduced from faith. We say that morality must come first, and faith, to those whose nature fits them to entertain it, will come out of the experience of a deepened moral life as its richest, choicest fruit.
Precisely because moral culture is the aim, we cannot be content merely to lift the mass of mankind above the grosser forms of evil. We must try to advance the cause of humanity by developing in ourselves, as well as in others, a higher type of manhood and womanhood than the past has known.
To aid in the evolution of a new conscience, to inject living streams of moral force into the dry veins of materialistic communities is our aim.
We seek to come into touch with the ultimate power in things, the ultimate peace in things, which yet, in any literal sense, we know well that we cannot know. We seek to become morally certain — that is, certain for moral purposes — of what is beyond the reach of demonstration. But our moral optimism must include the darkest facts that pessimism can point to, include them and transcend them.

Source: Hitch-22: A Memoir

"A Time for Moral Courage", Reader’s Digest (July 1964)<!-- Reprinted in The Virgin Island Daily News (29 October 1964) http://news.google.com/newspapers?nid=757&dat=19641029&id=rIcwAAAAIBAJ&sjid=lEQDAAAAIBAJ&pg=6379,1764784 with the permission of Reader's Digest -->
Context: I feel sorry for the man who has never known the bracing thrill of taking a stand and sticking to it fearlessly. Moral courage has rewards that timidity can never imagine. Like a shot of adrenaline, it floods the spirit with vitality.

"Tom Wolfe's Failed Optimism" (1977), Beginning To See the Light: Pieces of a Decade (1981)
Context: My education was dominated by modernist thinkers and artists who taught me that the supreme imperative was courage to face the awful truth, to scorn the soft-minded optimism of religious and secular romantics as well as the corrupt optimism of governments, advertisers, and mechanistic or manipulative revolutionaries. I learned that lesson well (though it came too late to wholly supplant certain critical opposing influences, like comic books and rock-and-roll). Yet the modernists’ once-subversive refusal to be gulled or lulled has long since degenerated into a ritual despair at least as corrupt, soft-minded, and cowardly — not to say smug — as the false cheer it replaced. The terms of the dialectic have reversed: now the subversive task is to affirm an authentic post-modernist optimism that gives full weight to existent horror and possible (or probable) apocalyptic disaster, yet insists — credibly — that we can, well, overcome. The catch is that you have to be an optimist (an American?) in the first place not to dismiss such a project as insane.

Characterizations of Existentialism (1944)