Shared ground
Psalm 77:19–20 looks back to Israel’s escape through the sea and uses that event to describe God’s guidance. The text makes several direct claims: God’s “way” went through the sea, God had “paths” through overwhelming waters, and yet God’s “footsteps were not known” afterward. Whatever the means, the result is clear: God “led your people like a flock,” and this leading happened “by the hand” of Moses and Aaron.
The passage holds two ideas together: God truly acts in history, and God’s action is not something people can fully track or map after the fact. At the same time, God’s guidance is not pictured as abstract; it is expressed through recognizable leaders.
Where interpretation differs
Some readers take “your footsteps were not known” to mean God’s method was hidden from human understanding (people could not explain how God did it). Others take it more concretely: God left no visible trail to follow (no “tracks” remained), highlighting how unusual and unrepeatable the sea-crossing was.
A second difference is how strongly the sea language is read as historical description versus poetic retelling. Many read it as a direct memory of the exodus event; others emphasize that the psalm is using that memory in poetic form, focusing less on mechanics and more on meaning.
A third difference concerns “by the hand of Moses and Aaron.” Some hear this mainly as God working through human leaders as instruments of guidance. Others hear a stronger emphasis on mediated leadership: God’s shepherding is experienced by the people primarily through Moses and Aaron’s concrete direction.
Why the disagreement exists
The key phrases are brief and poetic (“footsteps were not known,” “paths through the great waters”), so they can point to more than one closely related idea. Also, the psalm is clearly recalling a known story, but it retells it in imagery rather than in step-by-step narrative detail. Finally, “by the hand” can describe both agency (God acting through leaders) and means (leaders serving as the practical channel of guidance).
What this passage clearly contributes
These verses present God as one who can make a way where there is normally no way (“through the sea”), while remaining beyond full human tracing (“footsteps were not known”). They also link divine guidance with human leadership: God’s shepherd-like care for “your people” is shown as real guidance delivered through Moses and Aaron (using the idea of “hand” hand). The passage therefore reinforces both God’s sovereignty in impossible situations and God’s use of human leaders in guiding a community.