That quote doesn't refer to criminal justice. People know it from MLK, who was making a statement about the resilience of the faithful and righteous. MLK was

That quote doesn't refer to criminal justice. People know it from MLK, who was making a statement about the resilience of the faithful and righteous. MLK was actually quoting the 19th century abolitionist Theodore Parker, who was speaking of the inevitability of the end of American slavery.