In Exodus 3:4, this signifies influx from the Divine. (Arcana Coelestia 6840)

9452. The Lord in Divine Mercy regenerates a person, and that regeneration goes on from his early childhood right through to the final period of life in the world, and after that for evermore. By this means in Divine Mercy He draws the person away from evils and falsities and brings him to the truths of faith and forms of the good of love, and then maintains him in them. And after this in Divine Mercy He raises him towards Himself, up to heaven, and fills him with bliss. These are the things that are meant by the forgiveness of sins owing to mercy. People who think that sins are forgiven in any other way are completely mistaken. For to see a great number of people in hell and not to save them if this could be achieved in any other way would be the absence of mercy, when yet the Lord is Mercy itself, desiring the death of no one, but rather that he may live.