The atmosphere of this story is almost liturgical, radiating a sense of profound transcendence and solemnity. The purification (10s); the exclusivity of the place (12); the thunder, lightning, and thick clouds (16); the smoke, fire (18), and the blowing of a trumpet (19) all emphasize the absolute transcendence of the God who is establishing a covenant with Israel. This distinction sets him apart from any other god. The people cannot face a direct encounter with him; they need a mediator, and that mediator is Moses, chosen by both God and the people (20:19). Through this figure, the writers aim to convey a sense of security and confidence to the believer during the most critical moments in their history, especially when their lives are at risk.