Image credit: The Project Gutenberg EBook of The Good Old Songs We Used to Sing, '61 to '65, by Osbourne H. Oldroyd - http://www.gutenberg.org/etext/21566., Public Domain, https://commons.wikimedia.org/w/index.php?curid=3293411
So thick-head me celebrates words of Martin Luther King Jnr when in reality they were words of a popular hymn. You live and learn!
Now, that does not detract from how Martin Luther King Jnr delivered a great speech or from the message that God marches on before us. However, it does require that I revise my speaker notes to the presentation slide.
To which, it is necessary that I set out to change a slide of the sermon. A revised slide is depicted at this linked post.