
In 15:17 God is proving to Abram that he will be a father of many nations. He also tells Abram that his descendants will be in captivity for 400 years but they will eventually escape and go to a land that will be their own. In order to prove His power, God asks Abram to cut a bunch of cattle in half and lay them "half over against each other". Later that night God has a torch and a smoking pot travel between the two lines of slaughtered animals; through the blood. Now this sounds familiar, doesn't it?! Later in Exodus, the Hebrews escape Egypt. God was present with them as a pillar of fire by night and a pillar of smoke by day. Now maybe I'm reaching but do you see the similarity: smoking pot=pillar of smoke and torch=pillar of fire?
Now the theological similarity. With Abram a covenant was made as the fire and the smoke passed through the blood. With Moses the people were saved as the fire and smoke passed through the water. God made a covenant through the blood and saved them through the water. Almost 2000 years later Jesus saved us through the shedding of his blood and gave us the waters of baptism as a sacrament of salvation- through the blood and the water (also check out 1 John 5:6-8).
So, here are the symbols through out scripture that are full of power: smoke, fire, blood and water. What kind of emotions and memories do these symbols evoke for you?