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

“Loved, and no sin done! Ay, the world shall see
The quest is first—a love less terrible.
Yet, as I ride toward the edge of snow
That cuts the blue, I think. For even so
Comes reason to me: ‘Oh, return, return!
What folly is it for two souls to burn
With hell’s own fire! What is this quest of woe?
What is the end? Consider and discern!’
Banish the thought! My working reason still
Is the rebellious vassal to my will,
Because I will it. That is God’s own mind.
I cast all thought and prudence to the wind:
On, to the quest! The cursed parrot hill
Mocks on, on, on! The thought is left behind.” [via]