The first time the Lord revealed Himself to Moses was in a burning bush. He could have done His appearing in any form He wanted to, but chose this method -- a fire.  
Likewise, when the Lord chose to come down and meet the people of Israel for the first time after departing from Egypt, he showed up as thunder, lightning and a thick cloud with a very loud trumpet blast. All of the few million men and women who heard it trembled (see Exodus 19:16-24). 
The mountain itself did not speak, but the voice in the midst of the fire did.
It is interesting that at significant times when God showed Himself to people, He showed up in appearance of fire. To Moses in the bush, to the people of Israel on Mount Sinai as a mountain of fire, and the believers in the upper room in Acts 2 tongues of fire on their heads.  
Our God is a consuming fire (Heb 12:29, Deut 4:24). It's one of His many characteristics.We continue reflecting on the consuming fire of God's presence in this week's episode.
Don't forget to check out Benjamin Nelson's book I mentioned in the show, Encounters With Jesus. 
Check out our new Fire on Your Head iPhone app.
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Lili and I have a campaign on GoFundMe.com to help raise money for our travel expenses this year. Please visit this link if you’d like to partner with us to help us visit our family and be a blessing to other ministries and churches in North America later this year.