`But do not you know the word, Gandalf?' asked Boromir
`No!' said the wizard.
The others looked dismayed; only Aragorn, who knew Gandalf well, remained
silent and unmoved.
`Then what was the use of bringing us to this accursed spot?' cried
Boromir, glancing back with a shudder at the dark water. `You told us that
you had once passed through the Mines. How could that be, if you did not know
how to enter.
`The answer to your fist question, Boromir,' said the wizard, `is that I do
not know the word - yet. But we shall soon see. And,' he added with a glint
in his eyes under their bristling brows, `you may ask what is the use
of my deeds when they are proved useless. As for your other question: do
you doubt my tale? Or have you no wits left? I did not enter this way. I
came from the East.'
from The Fellowship of the Ring "A Journey in the Dark".