I have been reading "The Lord of the Rings" and came across this phrase in the "The Return of the King".
“Where will wants not, a way opens, so we say,” he whispered. “and so I have found myself.” Merry looked up and saw that it was the young Rider whom he had noticed in the morning. “You wish to go whither the Lord of the Mark goes: I see it in your face.” (p. 787, ch. The Muster of Rohan)
Here Eowyn disguised as a man (for she is not supposed to go to the war herself) is speaking to Merry (who is also not supposed to go). However both wish to go and Eowyn offers to take Merry with her hiding him under her cloak.
What does this phrase mean? To me, it appears that this is similar to the common phrase
Where there is a will, there is a way.
And it also fits the context. But what is the "not" doing in the phrase then? Can someone please explain this phrase. Did I misunderstand the meaning?