The Nameless Quest in The Gate of the Sanctuary from The Temple of the Holy Ghost (Collected Works, Vol I) by Aleister Crowley.
“‘Resolve all question by a moonward tread.
Follow the moon!’ Even so the king had said.
My thought had thanked him for the generous breath
Wherewith he warned us: for delay were death.
And now, too late! no moon is overhead—
Some other meaning in the words he saith?
Or, am I tricked in such a little snare?” [via]