“If there were just one possibility—either to do the good or to combat evil—man would have to opt for the first.”

Address at the Conference on Cosmic Design, American Association for the Advancement of Science, Washington, D.C. (April 1999)
This comment is modified in a later article derived from these talks:
:Frederick Douglass told in his Narrative how his condition as a slave became worse when his master underwent a religious conversion that allowed him to justify slavery as the punishment of the children of Ham. Mark Twain described his mother as a genuinely good person, whose soft heart pitied even Satan, but who had no doubt about the legitimacy of slavery, because in years of living in antebellum Missouri she had never heard any sermon opposing slavery, but only countless sermons preaching that slavery was God's will. With or without religion, good people can behave well and bad people can do evil; but for good people to do evil — that takes religion.
:* "A Designer Universe?" at PhysLink.com http://www.physlink.com/Education/essay_weinberg.cfm

Edicts of Ashoka (c. 257 BC)

Memoirs of J. Casanova de Seingalt (1894)
Context: My success and my misfortunes, the bright and the dark days I have gone through, everything has proved to me that in this world, either physical or moral, good comes out of evil just as well as evil comes out of good. My errors will point to thinking men the various roads, and will teach them the great art of treading on the brink of the precipice without falling into it. It is only necessary to have courage, for strength without self-confidence is useless. I have often met with happiness after some imprudent step which ought to have brought ruin upon me, and although passing a vote of censure upon myself I would thank God for his mercy. But, by way of compensation, dire misfortune has befallen me in consequence of actions prompted by the most cautious wisdom. This would humble me; yet conscious that I had acted rightly I would easily derive comfort from that conviction.

Source: The Life of the Mind (1978), "Thinking".

Rampart Institute, p. 431
The Fundamental of Liberty (1988)

Matterhorn: A Novel of the Vietnam War, Ch. 19 (2010).
Context: He thought of the jungle, already regrowing around him to cover the scars they had created. He thought of the tiger, killing to eat. Was that evil? And ants? They killed. No, the jungle wasn't evil. It was indifferent. So, too, was the world. Evil, then, must be the negation of something man had added to the world. Ultimately, it was caring about something that made the world liable to evil. Caring. And then the caring gets torn asunder. Everybody dies, but not everybody cares.It occurred to Mellas that he could create the possibility of good or evil through caring. He could nullify the indifferent world. But in so doing he opened himself up to the pain of watching it get blown away. His killing that day would not have been evil if the dead soldiers hadn't been loved by mothers, sisters, friends, wives. Mellas understood that in destroying the fabric that linked those people, he had participated in evil, but this evil had hurt him as well. He also understood that his participation in evil, was a result of being human. Being human was the best he could do. Without man there would be no evil. But there was also no good, nothing moral built over the world of fact. Humans were responsible for it all. He laughed at the cosmic joke, but he felt heartsick.

Book II, 1105b.9
Nicomachean Ethics

Source: The Tales of Alvin Maker, Alvin Journeyman (1995), Chapter 11.