The Nameless Quest in The Gate of the Sanctuary from The Temple of the Holy Ghost (Collected Works, Vol I) by Aleister Crowley.

“I turned—the path? My horror was complete—
A flaming sword across the earthquake gap.
I cried aloud to God in my despair.
‘The quest of quests! I seek it, for I dare!
Moonward! on, moonward!'” [via]