He prudently intimates his confidence concerning them, together with the pleasure he himself took (as any one would) in communicating the sentiments of holy truth to prepared, receptive minds; implying also, that any part of false doctrine doth so ill match and square with the frame of Divine truth, that judicious Christians may discern they are not of a piece.
Related Commentaries of 1 John 2:21
1 John 2:21
21 I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.