The quintessential speech that almost didn't happen

If you've never listened to it in its entirety:

Advisers had told Rev. Martin Luther King Jr., not to use the phrase “I have a dream” at his speech at the 1963 March on Washington. He had used the phrase before, and the final marked-through draft did not include the phrase.

But then, as he was winding up what John Lewis, then a student leader in the movement who had spoken earlier that day, called a “good speech,” the great gospel singer Mahalia Jackson, seated behind King, cried out — twice — “Tell them about the dream, Martin!”

And the good reverend looked over to his great friend, departed from his prepared remarks and began to preach his way into eternity.

You can say his speech is still relevant because the themes are timeless. You can also say that the speech is relevant because we have yet to realize the king dream.