Why is it dangerous to criticize God's messengers?

In Luke 10:16, Jesus warns that those who despise His messengers are essentially dismissing Him. This principle highlights that his representatives are extensions of God's own words and intentions. When one criticizes a true messenger of God, they risk hardening their heart against God's truth. History in scripture illustrates that such despising can lead to divine judgment, as seen in the case of Miriam and Aaron criticizing Moses in Numbers 12, where they faced God's displeasure. Recognizing this danger reinforces the need for respect towards God's chosen instruments for delivering His message.