What does Martin Luther King mean by "Continue to work with the faith that unearned suffering is redemptive?"

Answer 1

First of all, take those words apart.
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What does he mean by each word or phrase:

"unearned suffering" = ?

"redemptive" = ?

"faith" = ?

Let us know what you think.

Answer 2

He seems to be telling his followers to continue believing in God and in their civil rights cause. They didn't deserve to suffer, but they will prevail -- both here on earth and in heaven.