Shared ground
These verses shift from describing rebellion earlier in the psalm to speaking directly to political authorities (“kings” and “judges of the earth”). The “now therefore” signals that the appeal is a conclusion drawn from what has already been said about Yahweh’s settled rule and purpose.
The leaders are told to become wise and to accept instruction. The text treats their problem as both moral and intellectual: they are acting as though they can rule without reference to Yahweh, and they need correction.
Submission is not presented as mere awareness that Yahweh exists. It is active allegiance: “serve Yahweh.” That service is shaped by two paired attitudes—serious reverence (“with fear”) and real joy (“rejoice”)—but joy that remains humble (“with trembling”).
Where interpretation differs
How public or political the “service” is. Some read “serve Yahweh” as mainly personal allegiance: rulers must acknowledge Yahweh’s authority and govern with reverence, but the text does not specify policies. Others read it as necessarily public and governmental: because kings and judges are addressed as officials, “serve” implies shaping law and judgments in line with Yahweh’s standards.
Who is included in “judges of the earth.” Some take it as a sweeping address to all rulers everywhere, fitting Psalm 2’s global scope. Others think it could target a narrower set of authorities in the psalm’s world (nearby nations, or those involved in the conflict described earlier), even if it can be extended more broadly.
Why the disagreement exists
The commands are clear, but the details are not spelled out. The poem names offices (kings/judges) yet gives no concrete list of actions beyond “be wise,” “accept instruction,” and “serve.” Readers therefore infer different levels of public implication from the same basic wording.
What this passage clearly contributes
These verses portray political power as accountable to Yahweh (Yahweh), not autonomous. They also define appropriate response as a blend of reverence and joy: rulers are called to serve with “fear” (fear) while also being capable of rejoicing (rejoice) without losing sobriety (“with trembling”). The passage’s explicit claims focus on the posture of submission rather than the mechanics of governance.