An elaborate manuscript written in an unknown language: what can it mean? Decoding the Renaissance exhibition curator Bill Sherman suggests that "it's the mysteries that teach you." We may never know what the Voynich Manuscript says but considering why it was made may be the more interesting question.
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General notes
The Voynich Manuscript was on exhibit at the Folger as part of the exhibition "Decoding the Renaissance: 500 Years of Codes and Ciphers" from November 11, 2014-February 26, 2015, https://folgerpedia.folger.edu/Decoding_the_Renaissance:_500_Years_of_Codes_and_Ciphers