MLA formatting requires you to use in-text citations. You have to let the reader know where you found your resources.
The citation for your first quote would look like this in the text:
"I believe that what self centered man has torn down other centered men can build up" (King).
And then it would have a corresponding citation in your works cited page that looked like this:
King, Martin Luther, Jr. "Nobel Prize Acceptance Speech." 10 December 1964.
nobelprizes.com. 28 April 2009. <http://nobelprizes.com/nobel/peace/MLK-nobel.html>
(The nobelprizes.com would be underlined, but I don't have that ability here)
You wouldn't need to cite the Declaration of Independence because you have already introduced it in your sentence and it is common enough that the MLA says you don't have to cite it anymore.
When talking about your organization, omit the quotation marks. They are not needed for the name of an organization and they could be read wrong. "World Rights" Organization is like saying that the organization really doesn't stand for world rights—in this instance it is akin to making air quotes around the words and winking at the reader.
It is very well-written. I can picture you in a tux in Oslo giving your speech.
There are a few other minor errors (you don't need that apostrophe on the end of the word colleagues, for example), but I will leave those for another person or another day.