Do what you deem wise!

An example of negation in Quenya, both as an independent adverb as well as a prefix.

A translation was provided on the same page:

Not to do, in this case, what you judge good would be unwise.

Black Speech, Nandorin, Noldorin, Quendya, Quenya, Sindarin, Telerin are languages conceived by Tolkien and they do not belong to us; we neither can nor do claim affiliation with Middle-earth Enterprises nor Tolkien Estate.