John Gill Commentary 2 John 1:6

"And this is love, that we should walk after his commandments. This is the commandment, even as ye heard from the beginning, that ye should walk in it." — 2 John 1:6 (ASV)

And this is love, that we walk after his commandments
By observing them as a rule of conversation, in so doing love is shown to God; and such may expect the fresh discoveries of the love of God to, them; (See Gill on 1 John 5:3);

this is the commandment, that as you have heard from the beginning ,
you should walk in it ;
that is, this is the will of God, that his people should walk in the truth of the Gospel, and abide by it, as they heard and received it at their first conversion, from the mouths of the apostles, or other faithful ministers of the word; a reason for which, is given in (2 John 1:7) .