We have watched with horror as raging forest fires have consumed everything in their path.  The Israelites stood at the base of the mountain, and what was a cloud to Moses was seen as fire for them.  It was both.  Moses spent forty days there encountering the glory of God.  Jesus came down to us to reveal this glory.  We enter the cloud and experience the fire.

“When Moses went up on the mountain, the cloud covered it, and the glory of the LORD settled on Mount Sinai. For six days the cloud covered the mountain, and on the seventh day the LORD called to Moses from within the cloud.  To the Israelites the glory of the LORD looked like a consuming fire on top of the mountain.  Then Moses entered the cloud as he went on up the mountain. And he stayed on the mountain forty days and forty nights.” Exodus 24:15-18 (NIV)