I have long argued the concept of 'fixed personality,' and by direct 
extension 'personality (and other) related disorders.' It is all about 
what we choose to pay attention to, what we choose to take on, and 
disregard, grow into, and shed, as belief systems and world views: 
mindset. Ms Dweck has articulated it beautifully (below) I might need 
to buy her book. 

"A “fixed mindset” assumes that our character, intelligence, 
and creative ability are static givens which we can’t change in any 
meaningful way, and success is the affirmation of that inherent 
intelligence, an assessment of how those givens measure up against 
an equally fixed standard; striving for success and avoiding failure 
at all costs become a way of maintaining the sense of being smart or 
skilled. A “growth mindset,” on the other hand, thrives on challenge 
and sees failure not as evidence of unintelligence but as a heartening 
springboard for growth and for stretching our existing abilities."
-Carol Dweck, Ph.D