Remembering Dr. Martin Luther King Jr. with his own powerful words Share: This year marks 53 years since the assassination of Dr. Martin Luther King Jr. In honor of his legacy, take a look back at inspiring quotes from the civil rights leader and pastor. "Injustice anywhere is a threat to justice everywhere." (Letter from Birmingham City Jail) "We must use time creatively, in the knowledge that the time is always ripe to do right." (Letter from Birmingham City Jail) "The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy" (1963 book