Narcisstic Personality Disorder is a lifelong disability with no cure. You can be a nice person with NPD. You can be a wise person with NPD. You can even be a healthy person with NPD, because disorders and illnesses are two different things. Having NPD is like having type 1 diabetes. You can live a normal life, but it's still going to take constant attention to treat, and some stuff is always going to be just a bit harder for you. The myth that people with NPD are abusers is pseudoscientific bigotry. There are plenty of self aware people with NPD and there are plenty of non-abusers with NPD. People with NPD are most likely to be the victims of abuse compared to the abuser, but the kind of people who prey on the disabled to satisfy their own desire for cruelty don't want you to believe that.