2 John 1:3-6 (ESV)
Grace, mercy, and peace will be with us, from God the Father and from Jesus Christ the Father's Son, in truth and love.
 I rejoiced greatly to find some of your children walking in the truth, just as we were commanded by the Father.  And now I ask you, dear lady— not as though I were writing you a new commandment, but the one we have had from the beginning— that we love one another.  And this is love, that we walk according to his commandments; this is the commandment, just as you have heard from the beginning, so that you should walk in it.
So the lady has a few Children walking in the truth. John goes on to ask that we love one another. I do not think he means him and this congregation, but that everyone in the congregation learn to love one another. Love, I have said before and will say again, fulfills the law, it does not replace it. John explains this, we love by walking according to the commandments. So the commandment is to love, to love is to walk according to the commandments. It makes sense. What commandment can you break in the first table that by breaking it would show your love for God? Or which commandment of the second table can you break and thereby show your love for your neighbor, or fellow Christian? But among those commandments of Jesus is the command to preach repentance and the forgiveness of sins. And this is the greatest of love for both God and neighbor that we keep His gospel pure and proclaim it to those He loves, those for whom He died. What could be more loving than to proclaim the forgiveness of sins purchased with the Blood of Christ at the compelling of the Father’s love.