Shared ground
These verses present an example: present-day opponents are compared to “Jannes and Jambres,” remembered for resisting Moses. The text’s explicit point is not mainly to identify them, but to frame a pattern—resistance to recognized, truth-bearing leadership can look forceful for a time and still be exposed.
The passage makes several direct claims about the opponents: they “oppose the truth,” are “corrupted in mind,” and are “rejected concerning the faith.” It also makes a direct claim about the future: their advance has a limit—“they will proceed no further”—because their “folly” will become publicly evident.
Where interpretation differs
Who “these” are. Some read “these” as the specific people described just before (the manipulative teachers and their network in 3:1–7). Others take it more broadly as a recurring kind of teacher or movement that appears in the “last days,” not limited to one small circle.
What “rejected concerning the faith” means. Some understand it as God’s verdict: they fail the test of genuine Christian belief, so their standing “with respect to the faith” is disqualified. Others read it more as a community-level assessment: when measured against the apostolic message, their teaching and character prove unreliable, so they are recognized as unfit guides.
How wide “evident to all” is. Some take “all” as the whole Christian community involved in the conflict. Others allow a wider public sense, where exposure becomes broadly known beyond the immediate circle.
Why the disagreement exists
The passage uses brief labels (“the truth,” “the faith,” “all”) without spelling out the precise scope. It also draws on a named story reference (Jannes and Jambres) without narrating details, so interpreters must infer how tightly the analogy maps onto the current opponents.
What this passage clearly contributes
It portrays false resistance as both moral/intellectual corruption (“corrupted in mind”) and doctrinal failure (“rejected concerning the faith”), while also insisting that such opposition has a built-in ceiling: it will not keep advancing indefinitely. The “truth” is treated as something definite enough to be opposed and recognized, not merely a private opinion. The comparison to Moses’ opponents implies that time, testing, and exposure can reveal what is actually going on.
See also 2 Timothy 3:1 for the wider warning frame and 2 Timothy 3:5 for the contrast between outward form and inward reality.