What Does Exodus 20:18 Mean?

The people's multi-sensory encounter with the Sinai theophany produces the response that YHWH's overwhelming presence always elicits in sinful humanity: retreat. Thunder, lightning-flashes, trumpet-blasts, and a smoking mountain together create a sensory event without parallel in Israel's experience. The community's instinct is accurate: they are standing before something their fallenness cannot withstand. Their fear and trembling are not weakness but appropriate response to the genuine danger that unmediated divine holiness presents to those who are not holy. They stand far off because they should.

The contrast between the people's retreat and Moses' advance (verse 21) is the theophany's most important structural feature: "the people stood far off, while Moses drew near to the thick darkness where God was." The same stimulus produces opposite responses: retreat for the community, advance for the mediator. The difference is not courage but calling: Moses is constituted as the one who enters where the community cannot enter and returns with what the community cannot receive directly. The mediatorial office exists precisely because the people's response, standing far off, is both right and insufficient.

Hebrews 12:18-21 uses the Sinai theophany's terror as the contrast baseline for the new covenant's approach: "you have not come to what may be touched, a blazing fire and darkness and gloom and a tempest... But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem." The Sinai encounter that caused Israel to tremble and stand far off is the type whose antitype is new covenant access to the heavenly mountain through Christ's mediation. The same holy God is approached in both cases; what changes is the mediator through whom the approach becomes possible.