This text comes from The Poetical Works of John Keats, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
O Chatterton! how very sad thy fate!
Dear child of sorrow—son of misery!
How soon the film of death obscured that eye,
Whence Genius mildly flashed, and high debate.
How soon that voice, majestic and elate,
Melted in dying numbers! Oh! how nigh
Was night to thy fair morning. Thou didst die
A half-blown flow'ret which cold blasts amate.
But this is past: thou art among the stars
Of highest Heaven: to the rolling spheres
Thou sweetly singest: nought thy hymning mars,
Above the ingrate world and human fears.
On earth the good man base detraction bars
From thy fair name, and waters it with tears.