What happens when you read your copy out loud is that you will verbally stumble over all the places that are not smooth. Then, of course, what you do is rewrite the rough spots and read the copy out loud again.

And, what you do, is you keep repeating this process till your copy is completely smooth and you can read it without stumbling at all.

You see, advertising writing needs to be the best writing of all. It needs to flow from start to finish without a bump or a bubble.

-The Boron Letters, Chapter 22, Gary Halbert