What are your thoughts on this poem?

I saw a man pursuing the horizon by: Stephen Maria Crane

I saw a man pursuing the horizon;
Round and round they sped.
I was disturbed at this;
I accosted the man.
“It is futile,” I said,
“You can never — ”

“You lie,” he cried,
And ran on.

http://oldpoetry.com/opoem/show/5784-Stephen-Maria-Crane-I-saw-a-man-pursuing-the-horizon