Jesus was ... 'ill-advised'

From Matthew 5, the words of Jesus:

27"You have heard that it was said, 'Do not commit adultery.' 28But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.

I heard recently a well-known media figure say of these words 'I think they were ill-advised'. It isn't often, even in secular Australia, that you hear the teaching of Jesus challenged as to its wisdom. I was too shocked to respond with quickness of wit I am afraid to say. Not that secular people shouldn't challenge or question Jesus' teaching directly - it is just that they rarely bother to do it...

Not that my conversation partner was without insight here of course. He understood quite well that in this teaching Jesus raises the stakes for moral discouse quite appreciably. For Jesus, it is not only external actions that count - action that can be calculated as to the hurt they cause to others. No: the inner world of thoughts and desires are part of the picture. My disposition and my mindset - my 'heart': these are not out of the game, as far as Jesus is concerned. In this he is reminding Israel of the 10th commandment, against covetousness - a prohibition against ill-directed desire rather than against an evil action.

Was this 'ill-advised'? Did it bequeath to the Christian tradition a tendency to inwardness that leaves a legacy of psychologically harmful guilt? Did it leave us unable to think healthily about desire, unable to seperate the 'harmless' secret contemplations of the 'normal' individual from the pathologically harmful deeds of the criminal or the adulterer? Did it leave us terribly afraid of depictions of nudity in art (for example), depictions that are in fact harmless and even beautiful?

I don't think it was 'ill-advised' (of course). I think there is a terrible naivety - exposed by Jesus in the Sermon on the Mount - in imagining that we are capable of such self-mastery that we can nurture ill-directed desire without it affecting our outer world of relationships. Can a wife fantasise about another man while sleeping with her husband and imagine that there be no ill-effects - quite apart from the shattering inauthenticity and hypocrisy of the act, an act which is meant as an expression of desire for a particular other, and turns out not to be? Can we really leave lying around in the supposedly private chambers of our heart the desire that another fail, or be harmed, or even die, without resulting damage in the public world? Can we - ought we - live in such a two-faced way, that our inner and outer worlds are completely different? Is that what makes for whole and healthy, authentic people?