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

“‘Even I myself—my youth within me said:
Go, seek this folly; fear not for the dead,
And God is with thine arm! I reached the ridge,
And saw the river and the ghastly bridge
I told you of. Even then, even there, I fled.
Nor knight, nor king—a miserable midge!
‘Yet from my shame I dare not turn and run.
My oath grows urgent as my days are done.
Almost mine hour is on me: for its sake
I tell you this, as if my heart should break:—
The infinite desire—a burning sun!
The listening fear—the sun-devouring snake!'” [via]