My memory says that I used the exact url that was on the page from which I took the excerpt.
Yet, after your post, I clicked the link that I posted, and it only took me to the page with a list of sermons. (From which I took the one that included the excerpt.)
That's frames for you. One way to find the direct URL to articles when the site is using frames is to right click the link (in this case sermon 19) and open the article up in a new window. I figured the site was using frames when I first saw the scroll bar on the left. You can also view the source. Other than that, when frames are used you'll always get the impression you're posting the exact URL when you're not...