Whilst listening to a sermon last night on 2 John, I noticed you'd get a rather nice outline for a preach or even a series from verses 4-6,
Walk in the truth
Walk in obedience
Walk in love
I think it is a fair observation that Christians and churches often tend to emphasize walking in one path over another, e.g.fundamentalists focus on ( aversion of the truth) truth, sects focus on obedience, liberals focus on love, all to the detriment of the other paths. But for the elder each one flows seamlessly from the other two. It is not about balance or tension, they naturally encourage each other.
Just a quick thought ;-) let me know what you think.