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I disagree, he was paraphrasing early 19th century abolitionist Theodore Parker: https://en.wikipedia.org/wiki/Theodore_Parker

Another theologian for sure, but pretty squarely in the context of black rights in the US.

Some of King's best work was putting civil rights in a theological context. That's basically what Letters From A Birmingham Jail was about.

Despite the passive voice, I still think God and Christ were on King's mind when coining that. I'm sure if he were still alive, he'd agree.