In sunshine and in shadow,
Had journeyed long, singing a song,
In search of Eldorado.
But he grew old, this knight so bold,
And o'er his heart a shadow
Fell, as he found no spot of ground
That looked like Eldorado.
And, as his strength failed him at length,
He met a pilgrim Shadow.
"Shadow," said he, "Where can it be,
This land called Eldorado?"
"Over the Mountains of the Moon,
Down the Valley of the Shadow,
Ride, boldly ride," the Shade replied,
"If you seek for Eldorado." 
Psalm 23, Verse 4  states: 
 Though I walk through the Valley of the Shadow of Death, I shall fear no evil." 
 This line suggests that the only way to find El Dorado is to pass through the valley of the shadow of death, or in other words–die.
Eldorado