Alabama

“He who passively accepts evil is as much involved in it as he who helps to perpetrate it. He who accepts evil without protesting against it is really cooperating with it.”
– Dr Martin Luther King Jr. [1929-1968]

35

"Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that."
- Martin Luther King, Jr.

"I'm proud to be maladjusted"

on America

“The greatest purveyor of violence in the world : My own Government, I can not be Silent.”
- Dr. Martin Luther King, Jr.

dissident

"I break this law in service of a higher law."
- Martin Luther King, Jr.

"There is some good in the worst of us and some evil in the best of us."

- Martin Luther King, Jr.

Image source here.

unavoidably connected

"We are caught in an inescapable network of mutuality, tied in a single garment of destiny. Whatever affects one directly, affects all indirectly."

- Martin Luther King, Jr., [1929-1968] in his "Letter from a Birmingham Jail"

Greek Tragedian

"Wisdom comes through suffering." [Aeschylus 525 BCE~456 BCE]

There were riots in more than 100 cities across America after Martin Luther King Jr.'s death, on April 4th 1968. But that night there was calm in Indianapolis, Indiana:

RFK: "My favorite poet was Aeschylus. He once wrote. 'Even in our sleep, pain which cannot forget falls drop by drop upon the heart until, in our own despair, against our will, comes wisdom through the awful grace of God.'"

The quotation Robert F. Kennedy used in his remarks on the death of Martin Luther King, Jr. comes from the play Agamemnon by the Greek tragedian Aeschylus [525~456 BCE].
The quotation derives from Edith Hamilton's classic study, The Greek Way. The passage has been rendered in different ways by differnet translators.
What RFK attributes to "the Greeks" at the end of his speech -- "to tame the savageness of man and make gentle the life of this world" -- has also been credited to Aeschylus but has not been found in any of his extant works.
The entire text of RFK's remarks is available here on the Kennedy Library's Website.