Chief of organic Numbers!  
Old Scholar of the Spheres!  
Thy spirit never slumbers,  
But rolls about our ears  
For ever and for ever.  
O, what a mad endeavour  
Worketh he  
Who, to thy sacred and ennobled hearse,  
Would offer a burnt sacrifice of verse  
And Melody!  
 
How heavenward thou soundedst  
Live Temple of sweet noise;  
And discord unconfoundedst:  
Giving delight new joys,  
And Pleasure nobler pinions--  
O where are thy Dominions!  
Lend thine ear  
To a young delian oath--aye, by thy soul,  
By all that from thy mortal Lips did roll;  
And by the Kernel of thine earthly Love,  
Beauty, in things on earth and things above,  
When every childish fashion  
Has vanish'd from my rhyme  
Will I grey-gone in passion  
Give to an after-time  
Hymning and harmony  
Of thee, and of thy Words and of thy Life:  
But vain is now the bruning and the strife--  
Pangs are in vain -- until I grow high-rife  
With Old Philosophy  
And mad with glimpses at futurity!  
 
For many years my offerings must be hush'd:  
When I do speak I'll think upon this hour,  
Because I feel my forehead hot and flush'd,  
Even at the simplest vassal of thy Power,--  
A Lock of thy bright hair!  
Sudden it came,  
And I was startled when I heard thy name  
Coupled so unaware--  
Yet, at the moment, temperate was my blood:  
Methought I had beheld it from the flood.
John Keats
http://www.poemhunter.com/poem/lines-on-seeing-a-lock-of-milton-s-hair/