“The content of their character”

Today honors Martin Luther King, Jr., the man who said this:

“I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character.”

That seems clear, doesn’t it?  But actually the statement is interpreted in all kinds of ways.  See Debate swirls over Martin Luther King’s monumental ‘content of their character’ quote – The Washington Post.

How does the debate over the meaning of that speech parallel other disputes over interpretation, such as the interpretation of the Bible?