fortune.com – In the wake of the tragic shootings of nearly a dozen police officers in Dallas, internet users are sharing a speech from the past they say applies to our current situation.

Robert Kennedy’s eulogy following the 1968 assassination of civil rights leader Martin Luther King Jr. is considered one of the great addresses of the 20th century, a call for unity in a time of great unrest.

Twitter users posted excerpts of the speech, saying it applies now more than ever after gunmen killed five police officers in Dallas Thursday night, following a protest against police brutality after two black men were killed in separate incidents this week.