“In the end, we will remember not the words of our enemies, but the silence of our friends.”

1967 “Steeler Lecture,” Dr. Martin Luther King, Jr.

The “Steeler Lecture” was one of five sermons published in a book called “Conscience for Change,” republished as “The Trumpet of Conscience” after King’s death.

(source:  https://www.reference.com/history/quote-martin-luther-king-jr-s-speech-says-end-10507aacf0c7a90b#, retrieved 11/10/2016)