An Inclusio is a literary device used by biblical authors to direct their reader’s focus.
In 1 John 2, verses 18-23, The inclusio begins with verses 18-19, where we learn about the antichrists which is matched with verse 22 where the antichrist is also referenced.
What’s left in the middle are verses 20 and 21 which, I believe, is John’s main point.
1. Antichrist(s) (vv. 18-19)
a. Anointing (vv. 20-21) - Inclusio
2. Antichrist(s) (v. 22)
3. Application (v. 23)
Conclusion
It is the last hour. We do await the return of Jesus and while we do there will be many false teachers. We must be aware of them and we must also and primarily believe that our salvation is assured because the Holy Spirit has sealed us. We have been anointed by the Holy One.