Shared ground
This passage treats a community crisis: some people who were once part of the group have left and are now identified as serious opponents. The writer reads their departure as revealing something about them: they did not truly “belong” in the way that matters for this community’s identity (explicit in v.19).
The writer also frames the moment as “the end times,” using the appearance of “many antichrists” as evidence (explicit in v.18). In this context, “antichrist” is not introduced first as a distant villain but as a present reality connected to defections and denial (explicit in vv.18, 22).
A second shared emphasis is confidence for the remaining readers: they have an “anointing from the Holy One” and therefore “know” the truth (explicit in v.20). The writer’s point is reinforcement, not introducing a new secret: they already know, and truth and lie do not come from the same source (explicit in v.21).
Finally, the central dividing line is what is said about Jesus. The decisive falsehood is denying that Jesus is the Christ; this denial is also described as denying the Father and the Son together (explicit in vv.22–23).
Where interpretation differs (only where needed)
What “end times” means here. Some understand the phrase as mainly describing the whole period between Jesus’ first coming and his return, with the present crisis as one clear sign within that larger era. Others read it more tightly as the writer’s way of saying the community has entered a decisive, climactic season because the split has exposed opponents in their midst.
Who the “antichrists” are. Some take “many antichrists” as specific former members who are now teaching a rival message about Jesus. Others see it as broader: the deserters are the immediate example, but the term also covers a wider pattern of voices that oppose the apostolic message.
What the “anointing” refers to. Some interpret it primarily as God’s Spirit given to believers, enabling recognition of the true message. Others connect it more directly to the community’s received teaching and initiation into the faith, emphasized as a shared resource that protects them from deception.
Why the disagreement exists
The passage uses compressed, relational language (“end times,” “antichrist,” “anointing,” “have the Father”) without spelling out mechanisms. That forces interpreters to infer how broad the time-frame is, how far the labels extend beyond the immediate situation, and whether “anointing” points mainly to an inner gift, a communal teaching tradition, or both.
What this passage clearly contributes
It defines a boundary marker for authentic confession: denying Jesus as the Christ is not a minor difference but a direct contradiction of the truth the community received (vv.21–22). It also ties Jesus-confession to God-relationship: denial of the Son means not “having” the Father, while confessing the Son means having the Father also (v.23). And it offers a way to interpret a painful split: departure can function as disclosure—showing who was never truly aligned with the community’s core message (v.19). See also 1 John 4:2 for a later, related test focused on confession about Jesus.