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muad'nin does indeed knows about what he's talking about.
I'd just like to add that we often forget that
other adapation of Dune, the one that was done for Sci Fi in 2000. It was a 3 parts series and it was so much worse than the Lynch movie, in my opinion.
However, it was followed by Children of Dune. Also a 3 parts series, the first part was dedicated to the events of Dune Messiah. Now this series is a great improvement although not without some cringworthy moments. The major change it makes from the novel is that they have aged the twins, Leto II and Ghanima, from 10 years old to young adults.
If you are inclined to watch it, wait until after the Dune movie because spoilers!