God said to Moses, "I AM WHO I AM"; Exodus 3:14
Like the burning bush, God is perpetually self-existent. Alexander Maclaren wrote:
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 itself, 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 said, "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 un-derived, absolute, self-dependent, and therefore unalterable forevermore. Because we live, we die. In living, the process is going on of which death is the end. But God lives forevermore, 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 forever. And through the ages, the fire burns on, unconsumed and undecayed.