The bird always sings its glorious song, even if no one is around. He sings hoping that one day a change will come. The message of hope is powerful. When times are tough, hope can help get through it. No one's life is perfect. As long as they believe and hope, everything will be fine. “I can do all things through Christ who strengthens me” is a famous Bible verse from the book of Philippians. The oppression in the poem describes how the caged bird feels, but not the free bird. Angelou felt the need to express this in her poem because she grew up in troubled times. The caged bird represents her in the