The Rev. Martin Luther King Jr. Day, observed this year on Jan. 18, became a national holiday in 1983, 15 years after the death of the civil rights leader. He advocated the use of nonviolent means to end racial segregation, he first came to national prominence during a bus boycott by African Americans in Montgomery, Alabama, in 1955. His legacy endures, and in a moment of national racial reckoning, the holiday offers a timely opportunity to help it onward, through action and contemplation. Marches and parades, the typical forms of remembrance, are mostly on pause this year.