Dr. Martin Luther King, Jr. Day was assassinated on April 4, 1968. Nearly 53 years after his death, take a look back at inspiring quotes from the civil rights leader in honor of his legacy. "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 bookStrength to Love)