Shared ground
These verses describe a common human pattern inside the psalm’s larger story of trouble, rescue, and public thanks. The speaker remembers a season of “prosperity” and admits he spoke with strong confidence: “I shall never be moved” (an expectation of unshakable stability). That confidence is then re-framed: the stability was real, but it came from Yahweh’s favor, not from the speaker’s own strength.
The turning point is abrupt. When Yahweh “hid” his face, the speaker’s inner state changed immediately—he became troubled and distressed. In the psalm’s own logic, the felt security of the “mountain” stands or falls with Yahweh’s favorable presence.
Where interpretation differs
What the “mountain” refers to. Some read “my mountain” as a metaphor for a secure position in life (status, safety, settled circumstances). Others think it may point to a specific stronghold, city, or situation of protection. Either way, the point in the line is the same: Yahweh made what felt solid become firmly established.
What “hid your face” means. Some take it mainly as the experience of God’s help no longer being felt (silence, delay, absence). Others think it implies active displeasure or a deliberate withdrawal of protection. In both readings, the result in the text is clear: the speaker’s confidence collapses into trouble.
How absolute “never” is meant to be. The speaker may be confessing a boast, or simply exposing an untested assumption formed during ease. The verse functions as hindsight: the confident statement did not account for how quickly conditions can change when divine favor is no longer experienced.
Why the disagreement exists
The psalm uses compact poetic images (“mountain,” “face”) that can carry more than one sense, and it does not spell out the exact external circumstances behind the shift from prosperity to distress. Because the language is relational and experiential, readers differ on whether the change is mainly about inner perception, outer events, or both.
What this passage clearly contributes
Explicitly, the passage contrasts self-confident speech during prosperity with a later recognition that lasting security depends on Yahweh’s favor. It also presents a theology of dependence: when Yahweh’s favorable presence is withdrawn (however understood), the same person who felt unmovable becomes deeply shaken. The verses do not map a full cause-and-effect system for all suffering; they give one worshiper’s remembered explanation within a larger thanksgiving story (Psalm 30:1).