'Jesus is in fact inviting his hearers to something much more radical: an anticipation of what we might call eschatalogical authenticity. Yes, there will be a time when God's people will serve and love him, and live out the genuine humanness of what the ancient Law had spoken, "naturally" and from the heart. But this will be a God-given "second nature," a new way of being human. And you can begin to practice this now, difficult though it will be, because Jesus is here, inaugurating God's kingdom. It won't happen "automatically," precisely because God wants you to be, as we might put it, humans rather than puppets. You will have to think about it, to struggle with it, to pray for grace and strength; but this is at least now within reach. You can't collapse the whole question of "how to believe" into the command "It must come naturally; otherwise it isn't authentic." Jesus puts it the other way around: he says, in effect, "Follow me, and the authenticity will begin to happen." The authenticity that really matters is living in accordance with the genuine human being God is calling you to become. What the ancient Law really wanted - genuine human life, reflecting God's glory into the world - will start to appear.'
Tom Wright, Virtue Reborn, p.93.
