I Saw a Man Pursuing the Horizon

I really like this poem. It definitely says something about humans that is nearly universally true: We chase after pipe dreams, things we can never hope to achieve (sometimes knowingly). When people try to talk sense into us, tell us that we won't be able to do it, we become defensive. The speaker obviously has some sort of prior, outside knowledge that the man pursuing the horizon does not possess. But the man cannot and will not give up his futile efforts--just like most people.
I read a review of this poem that actually states the opposite, more light-hearted opinion of my own. It was about never giving up, and how even when people tell us to give up, we have to keep on striving toward our goals... I don't know. I think the fact that he's chasing the horizon kind of debunks that theory...