Once there was a man -  
Oh, so wise!  
In all drink  
He detected the bitter,  
And in all touch  
He found the sting.  
At last he cried thus:  
'There is nothing -  
No life,  
No joy,  
No pain -  
There is nothing save opinion,  
And opinion be damned.'
Stephen Crane
http://www.poemhunter.com/poem/once-there-was-a-man-2/