What poet face problem in octave of poem on his blindness?

In John Milton's Sonnet "On His Blindness," the poet grApples with feelings of despair and inadequacy due to his blindness. He worries about how this condition affects his ability to serve God and fulfill his purpose. The octave reveals his internal conflict between faith and doubt, as he questions whether he can still be useful in a world that values action and productivity. Ultimately, he learns that faith and acceptance of his limitations are equally valuable in spiritual service.