It seems he talks about some sort of disconnect from the emotion you may have, either positive or negative. Just accept that emotion but do not fuel it and let it control you. In a sense be apathic to your own emotion(s). That is why I posted my question: it seems unnatural to human nature.
On the other hand I have experienced that when highly concentrated somehow emtion seems to disappear, only when that concentration is broken emotion returns. But I am not at all sure that is the same.
Hope this makes sense...