This text comes from The Poetical Works of John Keats, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Not Aladdin magian
Ever such a work began;
Not the wizard of the Dee
Ever such a dream could see;
Not St. John, in Patmos' isle,
In the passion of his toil,
When he saw the churches seven,
Golden-aisled, built up in heaven,
Gazed at such a rugged wonder,
As I stood its roofing under.
Lo! I saw one sleeping there,
On the marble cold and bare;
While the surges washed his feet,
And his garments white did beat
Drenched about the sombre rocks;
On his neck his well-grown locks,
Lifted dry above the main,
Were upon the curl again.
"What is this? and what art thou?"
Whispered I, and touched his brow;
"What art thou? and what is this?"
Whispered I, and strove to kiss
The spirit's hand, to wake his eyes;
Up he started in a trice:
"I am Lycidas," said he,
"Fam'd in fun'ral minstrelsy!
This was architectur'd thus
By the great Oceanus!—
Here his mighty waters play
Hollow organs all the day;
Here, by turns, his dolphins all,
Finny palmers, great and small,
Come to pay devotion due,—
Each a mouth of pearls must strew!
Many a mortal of these days,
Dares to pass our sacred ways;
Dares to touch, audaciously;
This cathedral of the sea!
I have been the pontiff-priest,
Where the waters never rest,
Where a fledgy sea-bird choir
Soars forever ! Holy fire
I have hid from mortal man;
Proteus is my Sacristan!
But the dulled eye of mortal
Hath passed beyond the rocky portal;
So forever will I leave
Such a taint, and soon unweave
All the magic of the place."
So saying, with a Spirit's glance
He dived!