“Once in the darknet, you can buy anything you want, even in the dark side, you can order a murder.”
Source: https://promdevelop.ru/economy/darknet/
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1960s, Where Do We Go from Here: Chaos or Community? (1967)
Context: I say to you today that I still stand by nonviolence. And I am still convinced that it is the most potent weapon available to the Negro in his struggle for justice in this country. And the other thing is that I am concerned about a better world. I'm concerned about justice. I'm concerned about brotherhood. I'm concerned about truth. And when one is concerned about these, he can never advocate violence. For through violence you may murder a murderer but you can't murder murder. Through violence you may murder a liar but you can't establish truth. Through violence you may murder a hater, but you can't murder hate. Darkness cannot put out darkness. Only light can do that.

quoted by Book of African-American Quotations (Page 47).

The Chorus of the song. The only part that is actually sung in the song. At the end of the performance, after the first line is sung, Arlo will quickly add in the phrase "Excepting Alice."
Alice's Restaurant Massacree

“In the dark you can feel really close to a person. You can say whatever you want.”
Source: The Summer I Turned Pretty

“You cannot be anything you want to be. But you can be everything God wants you to be.”
Source: Cure for the Common Life : Living In Your Sweet Spot (2005), p. 18

"Chicago, which he once described to me as [...]", quoted by Kurt Vonnegut, 1986.
Nonfiction works
“Fear can only grow in darkness. Once you face fear with light, you win.”
Source: Life, the Truth, and Being Free (2010), p. 90