Shared ground
Psalm 66:5–7 presents God as publicly knowable through what he has done in history. The speaker calls others to “come and see” God’s deeds, describing them as awesome “toward the children of men,” meaning they have visible impact in human life (v. 5).
The psalm anchors that claim with a remembered rescue: God made a way through waters so people crossed on foot (v. 6). The memory is not told as trivia; it is tied to a communal response—“there, we rejoiced in him.”
The section ends by widening the lens. The same God is said to rule by might “forever,” to keep watch on the nations, and to oppose rebellion (v. 7). The picture is of ongoing oversight, not a one-time intervention.
Where interpretation differs
Some differences center on how specifically to identify the events in v. 6. Many read “the sea” as the Red Sea crossing and “the river” as the Jordan crossing into the land. Others think the wording may intentionally blend major deliverance stories without insisting on one river event.
Another difference is how to hear “there, we rejoiced in him.” Some take it mainly as reporting past joy at the time of the rescue. Others hear the past event being pulled into the present—“we” joining the ancestors’ story by speaking as one people.
Why the disagreement exists
The Hebrew poetry is compact and can “compress” history. It can move quickly from an earlier generation (“they went through…”) to a shared voice (“we rejoiced…”) without explaining the shift. Also, “his eyes watch the nations” is clearly an image, but readers differ on how literal to make the idea of divine surveillance.
What this passage clearly contributes
Explicitly, the passage claims (1) God’s deeds can be pointed to and examined; (2) his works are overwhelming from a human vantage point; (3) he delivered his people through impassable waters; (4) the proper communal response in that moment is described as rejoicing “in him”; and (5) God’s rule over peoples is lasting and active, with rebellion treated as futile (vv. 5–7). These claims ground God’s authority in both remembered rescue and ongoing rule, rather than in abstract ideas about power.
Exodus 14:21 and Joshua 3:17 are natural narrative backdrops for the sea-and-river language.