Blindness comes in different forms. It can be physical or spiritual. Jesus demonstrates the loving nature of His leadership as He heals a blind man, commissions 70 more to help Him proclaim the gospel, and teaches His disciples to pray.
Throughout our lives, cells continually duplicate as some die and some are replaced in a process of cell division, or mitosis. Can cells become immortal?
Does the Bible say anything about class struggle as the definer of human life? No, it does not. But there are certainly biblically based methods of dealing with it.