Shared ground
These verses present a universal summons: not only Israel, but “all the earth” and “all the inhabitants of the world” are called to respond to Yahweh with fear and awe (explicit textual claim). The fear in view is not described as panic, but as serious regard and humbled attention before divine greatness (inference drawn from the parallel with “stand in awe”).
The reason given is Yahweh’s unusually effective speech: when he speaks, what he says comes to be; when he commands, what he orders becomes established and secure (explicit textual claim). The poem treats Yahweh’s word as active power, not mere information.
Where interpretation differs (only where needed)
Two questions commonly arise.
First, what does “fear” mean here? Some read it as mainly reverence and worshipful respect; others think the word keeps an edge of dread because the one who creates and establishes reality is also able to oppose and judge (both are inferences; the text itself pairs fear with awe and does not narrate judgment here).
Second, what is the scope of “he spoke…he commanded”? Some take it as referring primarily to creation (echoing the wider biblical theme of God creating by speech). Others read it more broadly as a general statement about God’s rule in history and outcomes: what he wills is carried out and made firm (the text itself does not specify the object).
Why the disagreement exists
The lines are short and deliberately general. They do not name “creation,” “history,” or a specific event, and the key verbs (“spoke,” “commanded,” “stood firm”) can fit more than one setting. Likewise, the Hebrew word often translated “fear” can describe reverence, dread, or both depending on context.
What this passage clearly contributes
It contributes a compact claim about God’s authority: Yahweh’s word is decisively effective, and that reality calls for global, reverent awe (explicit logic marked by “For”). It also widens the horizon of Psalm 33’s praise: the appropriate response to Yahweh’s reliable word is not limited to one people but extends to the whole world. Psalm 33:4–5 supplies nearby context about the rightness and reliability of Yahweh’s word, and vv. 8–9 press that reliability into a universal summons.