Shared ground
Psalm 12:3–4 portrays speech as real social power. The “lips” and “tongue” stand for people and the influence their words have (explicit). The psalmist asks Yahweh to “cut off” flattering, harmful speech and boastful talk (explicit), then quotes the offenders to expose their mindset: they believe their will “prevail,” they treat their words as belonging only to themselves, and they reject any higher authority by saying, “Who is lord over us?” (explicit).
The passage assumes that human checks can fail and that Yahweh is able to restrain speech that misleads and dominates (inference grounded in the request). It also frames arrogance in speech as more than a personality flaw; it is a claim to control outcomes and resist accountability (inference from the quoted boast).
Where interpretation differs
“Cut off” can be taken in more than one way. Some read it mainly as silencing: ending the effectiveness and reach of deceptive talk. Others hear it as stronger language: removal of the speakers from their position of influence, or severe divine judgment on them. The text itself highlights stopping their speech-power, but the exact severity is not spelled out.
“Who is lord over us?” can also be heard with different targets. It may be a direct challenge to Yahweh, or it may be a broader refusal of any restraint—human authority, social norms, or divine oversight. The wider psalm’s appeal to Yahweh makes the Godward edge likely, but the line’s force is still a general rejection of accountability.
Why the disagreement exists
The poem uses vivid, compact language. Verbs like “cut off” and claims like “prevail” can range from social outcomes (winning, controlling narratives) to moral outcomes (escaping judgment). Likewise, the quoted question about “lord” can be read as either theological defiance or practical lawlessness; the psalm doesn’t specify a setting (court, politics, neighborhood conflict), so readers supply different scenarios.
What this passage clearly contributes
It presents manipulative and arrogant speech as a threat that needs restraining (explicit). It shows the inner logic of such speech: confidence that words can secure victory, a sense of self-ownership over speech (“our lips are our own”), and denial that anyone has the right to rule or restrain them (explicit). The passage supports a theology in which Yahweh is the final authority over human speech and its effects, especially when speech is used to dominate others (inference consistent with the request and the offenders’ denial).