"I am in Birmingham because injustice is here... I am cognizant of the interrelatedness of all communities and states. I cannot sit idly by in Atlanta and not be concerned about what happens in Birmingham. Injustice anywhere is a threat to justice everywhere. We are caught in an inescapable network of mutuality, tied in a single garment of destiny. Whatever affects one directly affects all indirectly. Never again can we afford to live with the narrow, provincial "outside agitator" idea. Anyone who lives inside the United States can never be considered an outsider..."
Perhaps most of all, I am shocked that this was written only a half century ago. I wonder what his thoughts would be on the current state of race relations in America. I encourage you to take a moment and read it today. You'll be glad you did.
Read the letter in its entirety here: Letters from a Birmingham Jail