Fire is the source of warmth, and so, in a sense, of life. It is full of quick energy, it transmutes all kinds of dead matter into its own ruddy likeness, sending up the fat of the sacrifices in wreathes of smoke that aspire heavenward; and changing all the gross, heavy, earthly dullness into flame, more akin to the heaven into which it rises.
Therefore, as cleansing, as the source of life, light, warmth, change, as glorifying, transmuting, purifying, refining, fire is the fitting symbol of the mightiest of all creative energy. And the Bible has consecrated the symbolism, and bade us think of the Lord Himself as the central fiery Spirit of the whole universe, a spark from whom irradiates and vitalises everything that lives.
Nor should we forget, on the other side, that the very felicity of this emblem is, that along with all these blessed thoughts of life-giving and purifying, there does come likewise the more solemn teaching of God's destructive power. 'What maketh heaven, that maketh hell'; and the same God is the fire to quicken, to sanctify, to bless; and resisted, rejected, neglected, is the fire that consumes; the savour of life unto life, or the savour of death unto death.
And then, still further, notice that this flame is undying--steady, unflickering. What does that mean? Adopting the principle which I have already taken as our guide, that the symbol and the following oral revelation teach the same truth, there can be no question as to that answer. 'I am the God of thy fathers, the God of Abraham, of Isaac, and of Jacob. 'I AM THAT I AM.'
That is to say, the fire that burns and does not burn out, which has no tendency to destruction in its very energy, and is not consumed by its own activity, is surely a symbol of the one Being whose being derives its law and its source from Himself, who only can say--'I AM THAT I AM'--the law of His nature, the foundation of His being, the only conditions of His existence being, as it were, enclosed within the limits of His own nature. You and I have to say, 'I am that which I have become,' or 'I am that which I was born,' or 'I am that which circumstances have made me.' He says, 'I AM THAT I AM.' All other creatures are links; this is the staple from which they all hang. All other being is derived, and therefore limited and changeful; this Being is underived, absolute, self-dependent, and therefore unalterable for evermore. Because we live we die. In living the process is going on of which death is the end. But God lives for evermore, a flame that does not burn out; therefore His resources are inexhaustible, His power unwearied. He needs no rest for recuperation of wasted energy. His gifts diminish not the store which He has to bestow. He gives, and is none the poorer; He works, and is never weary; He operates unspent; He loves, and He loves for ever; and through the ages the fire burns on, unconsumed and undecayed.
O brethren! is not that a revelation--familiar as it sounds to our ears now, blessed be God!--is not that a revelation of which, when we apprehend the depth and the preciousness, we may well fix an unalterable faith upon it, and feel that for us, in our fleeting days and shadowy moments, the one means to secure blessedness, rest, strength, life, is to grasp and knit ourselves to Him who lives for ever, and whose love is lasting as His life? 'The eternal God, the Lord ... fainteth not, neither is weary. They that wait upon Him shall renew their strength.'
The last thought suggested to me by this symbol is this. Regarding the lowly thorn-bush as an emblem of Israel--which unquestionably it is, though the fire be the symbol of God--in the fact that the symbolical manifestation of the divine energy lived in so lowly a shrine, and flamed in it, and preserved it by its burning, there is a great and blessed truth.