Hence that fantastic wantonness of woe, 
O Youth to partial Fortune vainly dear! 
To plunder'd Want's half-shelter'd hovel go, 
Go, and some hunger-bitten infant hear 
Moan haply in a dying mother's ear: 
Or when the cold and dismal fog-damps brood 
O'er the rank church-yard with sear elm-leaves strew'd, 
Pace round some widow's grave, whose dearer part 
Was slaughter'd, where o'er his uncoffin'd limbs 
The flocking flesh-birds scream'd! Then, while thy heart 
Groans, and thine eye a fiercer sorrow dims, 
Know (and the truth shall kindle thy young mind) 
What Nature makes thee mourn, she bids thee heal! 
O abject! if, to sickly dreams resign'd, 
All effortless thou leave Life's common-weal 
A prey to Tyrants, Murderers of Mankind.
Samuel Taylor Coleridge
http://www.poemhunter.com/poem/addressed-to-a-young-man-of-fortune-who-abandoned-himself-to-an-indolent-and-causeless-melancholy/