“It is on account neither of God's weakness nor ignorance that evil comes into the world, but rather it is due to the order of his wisdom and the greatness of his goodness that diverse grades of goodness occur in things, many of which would be lacking if no evil were permitted. Indeed, the good of patience would not exist without the evil of persecution; nor the good of preservation of life in a lion if not for the evil of the destruction of the animals on which it lives.”

Source: The House of Hades

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 14

"Lot's Wife"
Poems New and Collected (1998), A Large Number (1976)
Context: I felt age within me. Distance.
The futility of wandering. Torpor.
I looked back setting my bundle down.
I looked back not knowing where to set my foot.
Serpents appeared on my path,
spiders, field mice, baby vultures.
They were neither good nor evil now — every living thing
was simply creeping or hopping along in the mass panic.

Source: Meditations

537-539
Fruits of Solitude (1682), Part I
Context: A good End cannot sanctifie evil Means; nor must we ever do Evil, that Good may come of it. Some Folks think they may Scold, Rail, Hate, Rob and Kill too; so it be but for God's sake. But nothing in us unlike him, can please him.

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