Essays / Need Ideas! 5 Page Essay on concept defined by both author within their writing. [5]

I have a 5 page essay for an English Class. We have read Martin Luther King's "letter from Birmingham Jail" and Jonothan Kozol's essay "The Human Cost of an Illiterate Society"

The essay is on how both authors, Martin Luther King Jr. and Jonothan Kozol define a concept (any concept) and why is it of importance and relevance.

Could I get some ideas, on what possible things I should include and talk about. It's long essay, your ideas would be of great help.

Thank You!