[We all love you] because of the truth which continues to live in our hearts and will be with us forever.

Now love means this, that we keep on living in accordance with His commands. The command is this, that we continue to live in love.

Anyone who runs on ahead and does not remain in the doctrine of Christ [that is, one who is not content with what He taught], does not have God; but the one who continues to remain in the teaching [of Christ does have God], he has both the Father and the Son.