A learned man came to me once.
He said, "I know the way, -- come."
And I was overjoyed at this.
Together we hastened.
Soon, too soon, were we
Where my eyes were useless,
And I knew not the ways of my feet.
I clung to the hand of my friend;
But at last he cried, "I am lost."

Stephen Crane

http://www.poemhunter.com/poem/a-learned-man-came-to-me-once-2/