Speech delivered in Finney Chapel at Oberlin College (7 February 1957), as reported in  "When MLK came to Oberlin" by Cindy Leise, in The Chronicle-Telegram (21 January 2008) http://chronicle.northcoastnow.com/2008/01/21/when-mlk-came-to-oberlin/ 
1950s 
Context: The non-violent Negro is seeking to create the beloved community. He directs his attack on the forces of evil rather than on individuals. The tensions are not between the races, but between the forces of justice and injustice; between the forces of light and darkness.
                                    
“Attack the evil that is within yourself, rather than attacking the evil that is in others.”
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Confucius 269
Chinese teacher, editor, politician, and philosopher -551–-479 BCRelated quotes
“We must not only resist, but boldly attack prevailing evils.”
                                        
                                        Prefatory Address, p. 23 
Institutes of the Christian Religion (1536; 1559)
                                    
                                        
                                        Maxim 598, trans. Stopp 
Maxims and Reflections (1833)
                                    
Source: Stride Toward Freedom: The Montgomery Story
“Evil people never believe that they are evil; rather, they believe that everyone else is evil.”
Source: The Subtle Art of Not Giving a F*ck (2016), Chapter 6, “You’re Wrong About Everything (But So Am I)” (p. 133)
“I would far rather be ignorant than knowledgeable of evil.”
Source: The Suppliants, line 453; comparable to "where ignorance is bliss, / 'Tis folly to be wise", Thomas Gray, On a Distant Prospect of Eton College, stanza 10
“Evil must not be countered with another evil but, rather, repelled by an act of goodness.”
Understanding Islam, "Morals and Ethics" http://vod.dmi.ae/media/96716/Ep_03_Morals_and_Ethics Dubai Media