"And this is love: that we walk in obedience to his commands. As you have heard from the beginning, his command is that you walk in love." (2 John 1:6)
Second John, thirteen verses, is the shortest book in the New Testament. The Elder writes to the Elect Lady and her children, a designation understood by most scholars as a metaphor for a local church community and its members. He rejoices to find some of her children walking in the truth, and urges the whole community to love one another, which is not a new command but the one they have had from the beginning. And this is love: that we walk in obedience to his commands. As you have heard from the beginning, his command is that you walk in love.
Many deceivers have gone out into the world, who do not acknowledge Jesus Christ as coming in the flesh. Anyone who runs ahead and does not continue in the teaching of Christ does not have God; whoever continues in that teaching has both the Father and the Son. The Elder warns the community not to receive into their homes anyone who does not bring this teaching or to give them any greeting, because anyone who does shares in their wicked work. The Catechism draws from this passage the principle of doctrinal vigilance: the community of faith must distinguish between the hospitality owed to all people as persons and the endorsement of false teaching (CCC 2089).
Brothers and sisters, this is love: that we walk in obedience to his commands. John refuses to separate love from truth or truth from love. The love that ignores God's commands in the name of kindness is not the love John describes. And the obedience to commands that has no love is not the obedience John describes. Walk in love. Walk in obedience. They are the same walk.
Lord God, let us walk in love as you have commanded from the beginning. Give us the discernment to continue in the teaching of Christ and the courage to hold to it when those who would distort it come to our door. Through Christ our Lord. Amen.