Which prayer book are you quoting this from, the 1979? It surely is not from the 1928 BCP or previous prayer books.
It was a site on Jane Austin I found on the internet. I saw the recent BBC production with Colin Firth, and I really enjoyed it. I’m not sure which version it is.
At the end they have the voice over of the ceremony, with picture shorts of all the characters in the book where they have fallen short of the ideals embodied in the words. I thought it very well done.
Here’s the website. http://www.pemberley.com/janeinfo/compraym.html