Shared ground
These lines present judgment as planned rather than improvised. The speaker says there is an “appointed time,” and that the timing is chosen, not accidental (explicit claim). When that moment comes, the speaker promises judgment that is straight and fair (explicit claim).
The imagery widens the scope: the “earth” and “all its inhabitants” are pictured as shaking or coming apart (explicit claim). Against that instability, the speaker claims to hold the world steady, like supporting pillars that keep a structure from collapsing (explicit claim). The Selah pause marks the weight of that declaration (explicit claim).
Where interpretation differs
Who is the “I”? Many read the “I” as God speaking directly as the supreme judge who sets the time and guarantees fair judgment. Others think the psalm is voiced by a human ruler (or worship leader) speaking on God’s behalf, reporting what God will do.
What does “appointed time” emphasize? Some understand it mainly as the right timing for judgment (“when I choose my time”). Others think it can also imply a set occasion (a convened court-like moment) when judgment is formally delivered.
How should the world-shaking language be read? Some take “earth…quake/dissolve” as poetic language for social upheaval and political instability. Others allow that it could include real cosmic disturbance language, even if used poetically.
Why the disagreement exists
The poem does not name the speaker in these verses, yet it uses first-person language (“I choose… I will judge… I hold”). Also, Hebrew wording behind “appointed time” can point either to timing or to an arranged meeting, and the “pillars of the earth” can be heard as either standard poetic imagery or as drawing on ancient world-picture language.
What this passage clearly contributes
It links three ideas: (1) judgment is under deliberate control (“appointed” and “chosen”), (2) judgment is morally reliable (“blameless/upright”), and (3) the judge is not only the one who evaluates human actions but also the one who stabilizes the world during upheaval (“I firmly hold its pillars”). Within the psalm’s flow, that means coming judgment is neither random nor insecure, even when everything feels as if it is shaking.