What is the theme of the poem "he had his dream" by paul laurence Dunbar?

This poem is about being hopeful and optimistic. Specifically, it talks about a man who was hopeful throughout all his life. He was poor, yet he worked hard for better things to come. When bad times came, he didn't waver. He simply said that "The tempest will be short" and when it ended, went back to working hard for better days