“The appreciation of the merits of art (of the emotions it conveys) depends upon an understanding of the meaning of life, what is seen as good and evil. Good and evil are defined by religions.”

The Beatles Anthology (2000)

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

The Tragic Sense of Life (1913), X : Religion, the Mythology of the Beyond and the Apocatastasis

Source: Meditations

As quoted in Lives and Opinions of Eminent Philosophers, as translated by Robert Drew Hicks (1925)
Variant translation: The most momentous thing in human life is the art of winning the soul to good or evil.
As quoted in Ionia, a Quest (1954) by Freya Stark, p. 94

Entendia que há larga ponderação de males e bens, e que a arte de viver consiste em tirar o maior bem do maior mal.
Source: Iaiá Garcia (1878) ch. 3; Albert I. Bagby, Jr. (trans.) Iaiá Garcia (Lexington: University of Kentucky Press, 1977) p. 23.

The Devil's Notebook (1992)

Source: The Secret History