Why did Daniel respond with fear in his vision?

Daniel's response of fear upon encountering the vision can be attributed to the overwhelming glory of God's messenger and the awareness of his own sinfulness. Similar to Isaiah, who recognized his unclean state upon seeing God (Isaiah 6), Daniel's reaction highlights the stark contrast between God's holiness and human frailty. This serves as a reminder for believers today of the importance of humility and recognition of sin when coming before a holy God. Yet, this fear is met with divine reassurance, reminding us of God’s grace that covers sin and offers forgiveness through Christ.