“Good people can't out-think evil, 'cause evil think of things good folks can't think of. Can't enter your head what evil do.”

"Gun Violence? No! Goon Violence," http://www.unz.com/imercer/gun-violence-no-goon-violence/ The Unz Review, September 4, 2015.
2010s, 2015

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

Quotes from interviews, Sydney Morning Herald interview (2003)
Context: You can make fun with Saddam Hussein jokes … but you can't make fun of, say, the concentration camps. I think my target was not so much evil, but benign stupidity people doing stupid things without realising or, instead, thinking they were doing good.

Source: Christians and the Law-Courts

[In the Company of the Holy Mother, 68]

The Beatles Anthology (2000)

Other

Source: The Bell Jar

And further, one should think: "This leads to happiness in this world and the next."
Edicts of Ashoka (c. 257 BC)