We had a brilliant priest who used literary reference in his sermons quite often, but his brilliance was often a bit warped. In one of his sermons, he talked about having to sing like you don't need the money, loving like you'll never get hurt, and dancing like nobody is watching. He attributed the quote to William Shakespeare.
I really tried hard to keep my mouth shut; but in the end, I couldn't resist telling him I heard that concept in a country song recorded by Kathy Mattea. The song was "Come from the Heart," written by Susanna Clark & Richard Leigh.
Now, I suppose that Clark & Leigh might have gotten their ideas from Shakespeare, but somehow I doubt that.

Another time, he wanted me to read something to the congregation that contained a quote from St. Teresa of Avila - but the quote was grammatically illogical, so I changed it to something that made sense [mind you, Teresa was Spanish, and I can't blame her for having less-than-grammatical English ;-) ]
The priest swore he'd never have me speak before the congregation again, but it wasn't long before he forgot his pledge....and I continued to correct the grammar on stuff he'd have me read.

Bright guy -I think he had two doctorates- but a bit scrambled....

-Joe-