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Marianne Williamson is a very successful author, and her most well-known bit of writing is this poem, often misattributed to Nelson Mandela's first inaugural address. 
If your brain is jogging for that OTHER well-known misattributed piece of writing--the "Wear Sunscreen" speech--that was written by Mary Schmich and is often misattributed to Kurt Vonnegut. chicagotribune.com/news/columnist…
That almost sounds like a joke, but it's not. In fact, Vonnegut is so often given credit for that column that his lawyer received requests for years to reprint it.
