Then Peter said to Jesus, ‘Rabbi, it is good for us to be here; let us make three dwellings, one for you, one for Moses, and one for Elijah.’ He did not know what to say, for they were terrified. Then a cloud overshadowed them, and from the cloud there came a voice, ‘This is my Son, the Beloved; listen to him!’ Suddenly when they looked around, they saw no one with them any more, but only Jesus. (Mark 9: 5-8)

When in doubt Peter began talking. Another translation offers, "You see, he didn't know how else to respond, since they were terrified."

God's appearance seems a divine retort: Don't talk, just listen!

When afraid and uncertain Peter was inclined to take action. He was ready to begin construction.

Just listen! Don't try to take control. Stop your constant doing. Listen, consider, and understand.

It can require considerable discipline to simply be silent and listen for the voice of God.