A Neuroscientist can be the smartest man (or woman) on earth in his understanding of the human mind. He may know all the neurochemical changes underlying an outrageous behavior of a person. But when he gets mad himself, very little of his own scientific intellect would actually come in handy for him to control his rage. The virtue of self-control is a skill, which requires practice, regardless of all the neurobiological expertise in the world.