What does the Bible say about the fearful and unbelieving?

In Revelation 21:6-8, the fearful and unbelieving are identified as those who will face eternal punishment due to their cowardice and lack of faith. They symbolize those who, despite having opportunities to accept God's call, chose timidity and doubt over faith in Christ. The example of the rich young ruler illustrates this well; he was initially eager to follow Jesus but withdrew when faced with the cost of discipleship. His fear of losing earthly possessions ultimately demonstrated his lack of genuine faith. Thus, the fearful and unbelieving are portrayed as those who live in a state of rejection, facing the penalty of hell for their unfaithfulness and timidity.