The impulse to draw nigh.
Moses saw a strange sight; one that he had never seen before; one that struck him with astonishment. His natural impulse was to inquire into its cause. God has implanted in us all this instinct, and we should do ill if we were to combat it. Natural phenomena are within reason's sphere; and Moses, who had never yet seen a supernatural sight, could not but suppose, at first beholding it, that the burning bush was a natural phenomenon. That he approached to examine is an indication that he was a man of spirit and intelligence; not a coward who might have feared some snare, not careless and unobservant, as too many country folk are. He drew near to see more clearly, and to use his other senses in discovering what the "great thing" was—acting like a sensible man and one who had had a good education.