1 John 2:20

But ye have an unction from the Holy One. Ye are anointed with the Holy Spirit. Christian means an anointed one; Anti-Christ would mean against the Anointed. Hence John reminds them that they have been anointed by the Holy One.

And ye know all things. All things needful to guard against these opposers and seducing teachers. It is the privilege of those who have this anointing to know Christ experimentally (Joh 14:22,23).
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