Shared ground
These closing lines set a simple contrast: Yahweh is sovereign over “the heavens,” while human life takes place on “the earth” as a granted sphere (v.16). The point is not that God is absent from earth, but that God’s rule is unmatched and humans are not ultimate owners.
The passage also contrasts the living and the dead. The dead are described as not praising Yah and as going “down into silence” (v.17). Against that silence, the speaking community identifies itself as the living “we” and commits to keep blessing Yah from now on (v.18).
Where interpretation differs (only where needed)
Two phrases invite more than one reasonable reading.
First, “the earth has he given to the children of men” (v.16). Some read this mainly as a gift and responsibility: humans receive the earth as a place to live, work, and steward under God. Others read it more as an assigned realm: heaven is God’s special domain, and earth is the human domain, emphasizing human limits and creatureliness.
Second, “The dead don’t praise Yah” (v.17). Some take this as a straightforward statement about death ending worship, without trying to map out the afterlife. Others see it as implying that, at least from the psalm’s viewpoint, the dead are not actively participating in praise in any conscious way.
Why the disagreement exists
The language is poetic and observational. “Given” can describe responsibility, permission, or assigned territory. “Silence” can describe the social reality that the dead no longer join Israel’s gathered worship, or it can be read more literally about the state of the dead.
What this passage clearly contributes
Explicitly, it affirms Yahweh’s supremacy (“the heavens…of Yahweh”), a granted human sphere on earth, and a sharp boundary between the voiced praise of the living and the silence associated with death. It also frames praise as a communal identity (“we will bless Yah”) that begins in the present and is meant to endure (“forevermore”), closing with the familiar call to praise (v.18; yah).