This text comes from The Poetical Works of John Keats, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
"In after-time, a sage of mickle lore
Yclep'd Typographus, the Giant took,
And did refit his limbs as heretofore,
And made him read in many a learned book,
And into many a lively legend look;
Thereby in goodly themes so training him,
That all his brutishness he quite forsook,
When, meeting Artegall and Talus grim,
The one he struck stone-blind, the other's eyes wox dim."