{As for you} (humeis). Emphatic proleptic position before
the relative ho and subject of (886b)ousate, a familiar idiom in
 Joh 8:45  10:29 , etc. Here for emphatic contrast with the
antichrists. See  1:1  for ap' arch(8873) (from the beginning).
{Let abide in you} (en humin menet(935c)). Present active imperative
of men(935c), to remain. Do not be carried away by the new-fangled
Gnostic teaching.