Can someone help me understand an essay question for Univ. Of Chicago?

"Any law that uplifts human personality is just. Any law that degrades human personality is unjust," wrote the Reverend Dr. Martin Luther King Jr., in his "Letter from Birmingham Jail." What is "human personality?" Is it obvious what uplifts and what degrades it? Can law be justified on the basis of it? We want to hear your thoughts on justice as it relates to this "human personality."