Behold, a Smoking Furnace and a Flaming Torch - Genesis 15:17

Fire is the chosen emblem of God; and as these fire-emblems passed slowly between the divided carcases it was as though God accommodated Himself to the methods of human oath-taking, and solemnly bound Himself. But in all His dealings with us He is prepared to be both a furnace and a torch.
 
God as a Furnace. - Take up a piece of iron ore, and see how the metal is scattered amid commoner substances. How can it be disintegrated? The chisel cannot do it, but fire will. Plunge it now into the fire; let it fall in the heart of the glowing furnace, and presently the stream of liquid metal will issue forth, pure and beautiful. It is thus that God deals with human hearts; the blood makes propitiation, but the fire cleanses. The love of God, the purity of God, the spirituality of God brought home to us by the Holy Ghost, search and
try us to the innermost fibre of our being, and burn out of us the evils which had long held empire. Refining Fire, go through my heart, Illuminate my soul; Scatter thy life through every part, And sanctify the whole.
 
God as a flaming Torch. - The torch guides the footsteps through the dark; and God's Spirit waits to shed light on many dark and hidden things, and to guide us into all the truth. It is one thing to comprehend by the intellect; it is altogether another to apprehend by the heart. There is no such teacher as God; and the mistake of our modern religious life is to receive so much from man, instead of waiting in rapt silence until God Himself communicates His truth to us. The conditions are purity of desire, cleanness of heart, and willingness to obey.