Read: Matthew 17:1-13
But Jesus came and touched them, saying, "Rise, and have no fear." (Matthew 17:7 ESV)
Jesus took his closest friends with him to the top of a mountain and there they witnessed a supernatural event. This is often referred to as the Transfiguration. It was a moment when Jesus was momentarily revealed in his divine glory. It was revelatory moment for the disciples. It was something they did not fully comprehend.
Moses was there, Elijah was there, and Peter spoke prophetic things he didn't even understand. But the climactic event took place when God spoke in such a way that all in attendance heard and understood.
"This is my beloved son, listen to him."
The disciples were on their faces before the powerful voice of God. It was probably terrifying to hear the disembodied voice of the one true God. When the Father had finished speaking Jesus touched them and assured them that there was no reason to be afraid.
Today, we can walk, live, breathe, and enjoy the presence of The Holy God by way of His only begotten son. Jesus removes the fearfulness that exists between fallen man and God almighty, at least for those that have been covered by the righteousness of Christ. Apart from Christ there is much to fear about eternity. In Jesus there is an eternal reason to have no fear.