The first seven and a half lines of this poem are one big, long, confusing sentence. Here's our summary: "When I think of how I have lost my vision even before middle age, and how I am unable to use my best talent to serve God, I want to ask if God requires his servants to work for him even if they don't have vision."
But before he can speak up, a figure called Patience answers his question. Patience is like, "You think God needs your work? No, man. His best servants are the ones who bear life's burden the best. He already has thousands of people running around across land and sea to serve him. You can just stand right there and wait on him, and that's enough."